I think you could give a $100,000 college education trust fund to random HS seniors with no stipulations except it is spent on college and many would still not get a degree.
I'm not counterpointing any posts, it's just hard to do for many kids.
The scholarship commitment is the chip one needs to negotiate the amount of the MLB scholarship, if the team really wants that player. If you have a scholarship to the local Juco that is 5k, you have less to negotiate if you had a 90% commitment from Big out of State U.
So realistically, IMO, THE most important factor next to talent is the ability to have options. Once that players playing days are over, college is on his dime.
But I do agree that it's very hard for drafted HS players, that are drafted in upper rounds with a small bonus, small college commitment, probably won't further their education after release.