I dont necesarily think the Votto deal will hurt that much on the back end, at least not compared to the long term contracts we see with other superstars that flame out.
Votto doesnt rely on being a one-dimensional hitter. He may not be able to play every day like he did this year, but until he hangs it up, he's going to hit around .300, hit for enough power to be a capable HR hitter, draw walks, drive in runs, and he doesnt strike out at the rate of other big names. He may not be a bargain, but it certainly wont hold them back.