I wonder to what extent will programs like YC be funded by "donation" investments in the future? You only need a few Herokus to make enough successful founders

I wonder to what extent will programs like YC be funded by "donation" investments in the future? You only need a few Herokus to make enough successful founders for quite an "alumni" investment fund...and unlike my college alumni progam, few alumni would argue about "how their money is being spent". The only real problem I see in this is that it scales exponentially faster than PG is able to scale the number of companies he advises - but that might be solvable by, say, reducing the return of "donation" investments to make them more like pure "donations". Just like regular colleges, you can focus on alumni while still taking money and guidance from other interested organizations (like Sequoia) for the benefit of the participants.