Important questions! Bishops will continue to be educated (yes, I think that's the correct word!) in this vocation by those living it authentically and having been identified by their dioceses as being called in this way. Similarly, they will continue to be educated by chancery personnel who have direct and significant contact with such vocations (meaning Vicars for Religious or Consecrated Life, etc, who have discerned and helped in the formation of such vocations). It is my fervent belief that the church ought not succumb to the temptation of approaching c 603 as somehow deficient and then trying to resolve that deficiency by adding time frames and stages to the canon itself.
Consider in the Lexington case how truly abysmal the knowledge of c 603 or the vocation it governs was and perhaps still is. That was so, not only on the part of the local ordinary but also (and perhaps more fatefully!) on that of the canonist consulted in the matter. This is not a deficiency adding mandatory years or stages will resolve. In the main, the problem was not that of additional time or canonical stages, but rather of ignorance, and the studied resolution to use c 603 in a way contrary to the living charism it codifies despite having been instructed otherwise. A person came to Bishop Stowe with the proposal to use c 603 as a stopgap means of admitting him/her to public profession. S/he was aware that this could be done and had been done in the past, especially in the early years of the Canon's life; moreover, s/he knew all of this because I had written about it and s/he had read my blog for at least ten years. To complicate things, Bishop John Stowe bought into the proposal with the same question I have answered here several times, viz., whom could it hurt? Whom Does it Hurt? Meanwhile, the canonist consulted offered little substantively in response to this question apparently providing a legal loophole instead. While one hopes for better from those entrusted with the implementation of this canon, this is a rare vocation and a little-understood one.
And of course, that is the point! The solution is education and the only ones who can truly educate chancery personnel in this are hermits living (and living into) authentic vocations. To a lesser extent, chancery personnel with experience in discerning with a diocesan hermit will be helpful in this kind of education as well. Gradually bishops will come to see the character and quality of the vocation in front of them as they and other chancery staff meet with the candidate for profession, and this is as it should be. Of course, diocesan personnel need to read and consult on this matter as well. As I have written before, when I was first working with Sister Susan Blomstad, OSF (Vicar for Religious), she and another Sister from the chancery took a trip to New Camaldoli in Big Sur to consult with the Prior there. Susan had one major question, namely, what would it take for a person to live a healthy eremitical life? Years later, after I had met with Archbishop (then Bishop) Vigneron for the first time regarding my petition to be admitted to profession, he said, "Now I have to go and learn a lot" --- not only about this vocation but about me, my writing (including my Rule and published articles, which he had purposely not read yet), etc. I thought it a wise observation and I was very glad he took that tack!It seems to me that both Sister Susan and Bishop Vigneron recognized the Holy Spirit could be doing something new with Canon 603 and were open to taking extraordinary steps to be sure it was well-implemented. (For Sister Susan and her companion to take such a long drive from the Diocese of Oakland to Big Sur to meet with the Prior in person remains strongly suggestive of the kinds of steps dioceses need to take in order to educate themselves re solitary eremitical life. Of course, today, the church's history with the canon is more extensive than it was in the mid to late 80's, and some of us are willing and now able to assist dioceses in working with candidates so that both the candidate and the chancery personnel themselves grow in understanding of solitary eremitical life. Still, education is the key.
You asked if I could see any use for increased requisite time frames and my answer is yes, in one case. I believe that there should be a minimum time frame of five years before a person is admitted to even first vows under the canon. I believe this could apply even if the person has a history of religious life, because the transition to solitary eremitical life is still significant. If one is called to this vocation, five years will not be onerous but will be given over to growth and coming more and more to embody the values central to c 603 in any case. At the same time, diocesan personnel will be able to work with the person regularly and will be able to learn about the candidate, as well as about the depths and breadth of the canon itself. But it seems to me that apart from this minimum time frame, the multiplication of stages, etc., are simply unhelpful and could give a false sense of progress when the person is no closer to becoming a hermit at all. Jumping through such canonical hoops may simply tell us the person is desperate to be professed publicly and is a good "canonical hoop jumper", but not that they have heard or responded with fidelity to a divine call to desert existence!