I'm sure many people would. Your proposal appears to be that YC do this exact program, but with a 200k+ grant instead of 12k. This is obviously not feasible, given that these grants are being awarded for little more than an idea.
Founding a startup is a huge risk, there's no way around that. If you're at a point in life where you can't afford risk and instability, it's going to be tough to start a startup.
Frankly I don't really get the "startups are only for young people with no obligations" problem. You have a wife, and kids, and a house, and hopefully these things bring you great joy - the prototypical obligation-free startup founders have none of them. Should we be looking for ways for young startup founders to do the family-building stuff they are missing out on? Maybe set up a fund to give them a down payment for when their startup fails and they could have been saving up with a paycheck for a few years? It just seems like...sometimes in life you have to choose one thing or the other.