I'm personally highly biased, as I transferred for athletic reasons, but I don't see the transfer portal as that big of a deal. People change and learn a lot fresh out of high school. I don't think signing an NLI should start some sort of prison sentence where you HAVE to stay at any certain school.
As for paying athletes, it's hard to believe that it won't become some sort of slippery slope that fundamentally changes college athletics. I think it would be particularly helpful for Nebraska, so selfishly I'm OK with it, but I'm not sure that it will be a good thing for college athletics as a whole.