Another think I think we should seriously explore.
Given the fact that it is hard to know who is going to succeed in ministry until they succeed, I would suggest that the major "gatekeeping" function be, not at preliminary fellowship, but at Final Fellowship. At that point, the record of a new minister's ministry can speak for itself. Most will have clearly succeeded or failed and will not even need to be interviewed, which is no small expense for candidates or for the UUA. (The interviewing will have been done by one or more search committees who actually spend a lot more time with candidates than the MFC and whose judgment, in congregational polity, should be respected.) The requirements for Preliminary Fellowship might simply be the passing of RSCC, background check, and careful scrutiny of documents, not for "ministerial presence" (which only appropriately develops in ministry, after all) or preaching ability (congregations can be trusted to judge for themselves whether they want to hear this person) but for psychological health and a healthy attitude towards ministerial leadership.
Persons in preliminary Fellowship would be provisionally ordained and it would be suggested to congregations that they be hired for a three year term, with the possibility of a call extended after Final Fellowship is granted.
The advantage of this is that almost everyone would search for a church in their senior year of seminary and begin to work the next Fall, and when they were judged, they would be judged on their record, and that would, for most people be much less anxiety-producing. Lots of things to think through, of course, but I think this approach (more like what the Methodists do) is worth thinking about.