That isn't really realistic. The world is complicated and people are always going to disagree. Even if everyone ends up on "the left" or "the right" relative to now, there'd just be divisions in that group - even now we see this even within the parties now, not to mention having a particular direction being pushed always generates momentum in the other direction similar to Newton's 3rd law. Don't get me wrong, it might be nice if we all agreed in theory, but history and experience suggests that's not likely to ever come to pass. And I am not sure what the consequences would be if certain ideas had no countervailing forces.