No one has ever been convicted. It's irrelevant that impeachment is brought up over and over again cause it's never happened. Yes, you could argue Nixon would have been, but it didn't happen.
So, I don't think we're over saturated on impeachment.
Is it a sad commentary that it's talked about all the time? Sure. But, Obama was about as honorable a President we've ever had and it was still brought up while he was in office. So, it's just part of the politics of the nation.