There are many situations to consider. Some LD kids spend a majority of the day in the regular classroom, some spend very little time there (lunch, art, PE). Some are educated in different schools, some are educated at home. There is quite a bit of evidence to support inclusion of LD or disabled kids in a normal classroom setting, as much as possible. It is beneficial for both the LD and non-LD kids. There are some kids that should never be in a regular classroom setting. I am not sure I understand what you are saying. Do you want to keep special ed. students out of regular classrooms? Do you want them in Special ed only classrooms? (this is much more expensive)
Quit pretending that schools help them or us.