Anyone else figure out how to get rid of the extremes by both parties? I guess not?

Then is it possible to have 1 party such as democrat or republican be elected for a 12 year term and then the next 12 years would be the other parties term. If you look at everything not enough gets done when we elect a new president as he must fight the opposing party. By possibly doing as such it might whip the $hit out of extremist from both sides and perhaps more can get done under a system geared towards less unknowns.