Back in the 70's and 80's state appropriations covered between 70-80% of tuition. Now my state covers roughly 35-40% of funding for most public universities [1]. Part of this is the university offering more programs - athletics, counseling, therapy, other student services, which all need additional funding. The other part is that state funding is going down due to a variety of political budget reasons.
[1]: https://www.house.mi.gov/hfa/PDF/Summaries/21h4400h2cr1_Educ...
I never applied to any public school, but I was legitimately worried about not being accepted. I wouldn't depend on it.
I'm really glad I went to a private college in the end. People who went to state schools said class sizes were huge (like 150 students per class) and they were being taught by TAs. I really don't think I would have succeeded in that sort of environment - At my private school we didn't have any TAs and I never had a class over ~30 people, which was important because classes were very interactive.