There were a lot of reasons busing ended. I would not have wanted my son to be bused from a good suburban school to an urban school just to make that school less black.
In many cases you were talking about forcing kids to be on buses for long rides to and from school. Would it help to make a school better? Hell no. The funding basis for the schools remained the same. Schools near my home were well funded, due to high home prices and real estate taxes, which schools in the inner city were not.
Face it, busing was a feel good plan with no hope of success.