I agree that it's impossible for the rates of economic growth and lifestyle improvements we saw since the late 1800s to continue indefinitely, but the key to growth is investment. And from the late-1800s till the mid-1900s, there were huge government investments made in building new and innovative infrastructure in the US--railroads, the phone network, state universities and K-12 public education, electricity generat…
I don't think your point about education makes sense. You want more investment, but then bemoan the fact that it costs more, as if that signifies low investment. People are investing in their education at record levels!
Maybe you think student loans are a problem for other reasons, but they certainly aren't stopping people from going to college. Again, they're going in record numbers and spending record money to do so.