Then none of the people in top universities would be there. Talented researchers go to top-tier universities for their PhD because they want to work on research professionally. They do not wish to teach, they are forced to do it because academia is, for the most part, the only place left where someone can be a professional researcher. Although there are still corporate research labs around, the days of Shannon developing Information Theory at Bell Labs are long gone.

Quite frankly, I'm fine with this setup. If you want to have a good undergraduate education provided to you by the professors, go to a school where they have that as a priority. If you want to get involved in pushing the boundaries of knowledge, then go to a place like MIT or Stanford and get involved in an undergraduate research program.