I dont think the site will work but i do think it solves some issues.
I would think an athlete with $500,000 pledged to them after they graduate in 1 year (guaranteed) should be able to get a measly $100k loan from the bank (albeit unsecured)
The issue I think will arise is that no one will pay that much money for them to stay. I see close to zero $ going in until the ending part of their junior year.....and only for a select few athletes. That and now college kids would start bluffing about them thinking about going pro...that will tilt me