State governments are not going to abandon disabled students. All those federal laws and policies are found at the state level as well. Some states may even have stricter policies.
What I hope it will mean is that people will be discouraged from filing complaints that have no merit because now such complaints may take longer to be reviewed.
My experience was different. My youngest son had an IEP in San Diego and he was getting a decent education. We moved from San Diego to Pocatello, ID when he was in 8th grade. Idaho theoretically has to follow those federal guidelines to generate and implement a similar IEP program. Idaho failed MISERABLY. The teachers didn't even try. Compounding the problem is that I had to be in San Diego to keep the household finances functioning, so I couldn't detect and correct the failing by the schools. By the time I did get home, I had a high school dropout. I tried to get my son to pursue a GED to no avail. He was perfectly happy to write enhanced first person video games in Lua and build complex computer configurations. No interest in school. His reward for that today is he is a manager at a Valvoline shop. That pays the bills and is decent money for a high school dropout.