The game is definitely shifting to being more of a power game, but there will always be room for good slappers. Albeit, not too much room. Maybe one per team. You just give up too much if you have a bunch of slappers in your lineup. I've seen it first hand. My DD's TB team had FIVE of them. At a certain point it really limits your ability to have big innings because it decreases your margin for error when all you do it get singles
So yes there will be room for slappers, but only for the best of the best of them. The rest will be turned out to pasture.
Yeah, we played a team once where it seemed like they were all slappers. Granted we're 10U. We beat them easily as they all grounded out.