.
Oh, well Heaven forbid those training for the priesthood train uncomfortably!
I would venture to say that the reports of 3 (or even 2) seminarians in a room are made up. Room sizes were way too small to accommodate more than 1, and possibly 2 if you stuck a bunk-bed in the room (and then they'd be sharing, i.e. taking turns at using, a desk). Rooms there are really very small, enough for a bed, a desk, and a little sink we used to have.
Whatever the case may be, however, the overcrowding was caused by adding that "Humanities" year and not due to some alleged explosion of vocations, and any such overcrowding could have been remedied easily and inexpensively by simply adding a wing onto the existing building. Winona/STAS had many acres of land and could easily have been expanded.
There were clearly non-practical reasons driving the move.
Of course, given the fact that we now have many cradle Trads growing up and going through places like St. Mary's, one would certainly have expected a large increase in vocations ... but it's just not happening, leading one to question what the SSPX are actually doing. Back in our day, seminarians were coming randomly from here, there, and the other place. Now, from what I understand, the vast majority are coming from St. Mary's, but the total numbers have simply not increased that much from when I was there going on 35 years ago now. Perhaps part of the numbers were offset by the FSSP option, and some additional SV options.