This isn't rocket science. Wouldn't it stand to reason that the big power hitters would be hitting more doubles/triples and less homers if homers were becoming doubles/triples? They aren't.
So, since that's not the case, let's move down the line. Wouldn't it stand to reason that triples hitters, who didn't hit many homers, would be getting more doubles? They aren't.
So, and this is the final piece of the puzzle, wouldn't it stand to reason that doubles hitters, who didn't hit many homers/triples, would hit less doubles? They aren't.
Obviously, since you're looking at individual players(and we know that's a small sample size disaster waiting to happen), there's a lot of room for error. But what is happening is what it happening. The only noticable change in hitting is coming from the big power guys. And they are hitting less homers, more singles.