Guys go to these schools because under the circumstances it's their best option.
Give them the option of living in the US, getting paid, and playing against good competition...and you will have more Mudiay's go that route.
Not sure I understand what you are saying with the Dakari, Marcus, Tyler example...regardless of what they do, they will always be late first/second round picks, under this option they make a few hundred grand in the process...seems like a pretty good deal.
Of course this model needs to be more proven, I'm not talking about a bunch of guys going to it this year, next year, or even the year after...BUT, in 5 years, if this sustains itself in the short-term, it will have a major impact on players and the college game. And the NCAA has only itself to blame because of BS rules and regulations.