I see that as a decision for the 3rd or 4th string QB...the thought of NEVER seeing the field. But being the 2nd string, behind a kid that hasn't taken a snap in almost 2 years, in an offense where it's extremely conceivable to get dinged up...that's a scenario that could absolutely place you into a position to get an opportunity to move ahead.
Let me end this debate because you seem to be confused on what Gebbia wants...
Gebbia's goal isn't to play a game here or there if the starter is banged up or in mop up time. His goal is to be drafted and play in the NFL. So, for 10,000 Schrutte bucks.... how many backup QBs on spot duty in college are playing in the NFL now? How many have been drafted? Your answer to those is why Gebbia left.
Everyone is getting Husker fan thought process confused with Gebbia thought process. I'll simplify it:
"Husker fan not worried about kids future just the Nebraska football teams" : Should have stayed because someone can always get hurt and you end up starting a few games. See Martinez hurt! Gebbia made the wrong call!
"Gebbia or any QB wanting to get drafted or play in the NFL that has eligibility left": Go where you are going to start and have a ton of film to show NFL scouts what you can do. Not just a few games when the starter is injured.
Based on who you are there, is why you are right or wrong in the Gebbia transfer discussion. I lean towards a kid doing what's best for himself, even tho it puts my team in an awful spot. It sucks, I get it. Gebbia got the best advice he could. It was the same advice Baker Mayfield, Cam Newton, and Russell Wilson got. When someone can find me an example of a guy getting beat out by someone his same age, sticking it out, and still getting drafted, i'll shut up. But I have a feeling we will be waiting a while except the once every 7 or 8 years exception the rule, not the norm.