Rent/living cost is another matter, but tuition can be still be reasonable if you state in state and don’t attend expense universities.
But I totally agree - there is a lower/lower middle class of people that attending college is vet challenging and free tuition for all at some schools would be massively beneficial for them and society.
If your parents earn $150k/year in California, their after-tax income will be about $100k/year.
If I was to propose something I'd make in state tuition fully free for residents, and if that cost too much maybe make people do the first 2 years at a community college. Honestly I credit community college with turning my life around. I ended up graduating from a state school and I'm very happy with my degree! It's not in computer science, but after a very long journey I feel it's something to be proud of.
The best part about college is your free to take time off and finish later.