I think many entrepreneurs just don't want to take that high risk of failing anymore, as with startups the odds are against you. And even if they would want to,

I think many entrepreneurs just don't want to take that high risk of failing anymore, as with startups the odds are against you. And even if they would want to, I can imagine successful entrepreneurs have more money then they would need for a new company, so why wouldn't they want to invest that money into other startups, a world they understand well?