I want to preface my post here saying I think you're a really good poster, I think this post is well thought out, and I agree with your basic premise that there are a lot of obstacles in ND's current situation to keeping the roster stocked with QBs.... I think there is a realistic chance of any (or all) of our other QBs transferring if Golson wins the job for a myriad of reasons
BUT.........
There are two points I want to touch on:
1. The idea that "South Bend isn't fun" or in general the list of factors you give, in my opinion, have almost absolutely nothing at all to with whether someone chooses to transfer or not. If you're miserable, for whatever reason, you'll transfer.... but the VAST majority of the kids on any team won't fall into that group/have already transferred if they do fall into that category. Most football players and athletes in general I knew at ND, simply put, had the time of their lives in college and wouldn't trade it for the world.... for every emotionally ill-equipped kid like Aaron Lynch there are 10 that love life. I can't think of a single friend of mine who I could classify as "unhappy" at ND. I knew one kid from Boston my frosh year who transferred out to BC because he didn't like it but that's it. I'm not saying everyone is 100% happy 100% of the time or anything stupid like that.... or that everyone loves the winter...... but I'm saying the vast majority of people attending ND are thoroughly enjoying their time there and the primary reason is almost always related to something sports oriented
not school/fun/social life oriented. I can give real life examples if you want of people and the transfer process (at ND and at other schools) but this post is already long and rather rambling.
2. The thing about the team playing at an elite level to keep kids on the roster isn't really accurate. If you're a 5

kid and you're not playing then you're likely to transfer. Period. Winning a NC on the bench is not enough. Usually kids will stick around behind elite talent at their position because they both respect the person ahead of them and assume they will get their shot. That's why 4

kids at Stanford stuck around behind Luck... because they expected him to leave a year earlier than he actually did and because they knew they'd have a chance to earn a spot. The single biggest driver in a kid transferring is getting passed up by somebody in their class or the class behind them... and especially at positions like QB where only one guy gets on the field. Because as soon as that happens, you know you are f*cked and if you put any value on going pro you basically have to make a move. That's why Kyle Prater, despite USC being the NC favorite this year, got the heck out of dodge... he got passed up by frosh Marquis Lee and said "eff that noise, I'm going to a school where no receivers are close to my level."