The arc's effect on shooting percentages

There is no doubt that basketball has learned how to shoot well from one narrow strip around the perimeter of the basketball playing area. But how has that fact affected the shooting from other places on the court. The Rules Committee has dictated that players must shoot from THERE (well, not actually dictated it, but it amounts to that). However, in the regular ebb and flow of the game, THERE might not be the best and most natural shot to take. So, the players take a shot from the wrong spot, and get in a groove shooting from that spot, because it is about the only spot they ever practice (and if you don't believe that, just watch pre-game warmups). But what about their overall game? It seems logical to me that if other facets of shooting are neglected with the fixation on the 3-point line, then shooting percentages from other spots might be going down as shots from the line are going up. No way to prove it, I guess, but it is a thought.