The NCAA Tournament is (should be) a tournament of teams that had exceptional seasons - similar to the Champions League in soccer. I think NET has a place in the process, but it should just be one component.
I'm also not against expanding the tournament. But, I think you have to do that with an implicit eye that some of whatever number of expansion teams are for the purpose of adding mid-majors that had exceptional seasons, but got upset in their conference tournaments... not just the next whatever teams in NET.
I'm also not against expanding the tournament. But, I think you have to do that with an implicit eye that some of whatever number of expansion teams are for the purpose of adding mid-majors that had exceptional seasons, but got upset in their conference tournaments... not just the next whatever teams in NET.