Why? Why can't we leave Harper in center and bring in a power hitting leftfielder?
Bryce Harper's future is a 50 homer a year All-Star. If he grows any more, it may be best to move him to the corner outfield just to slightly reduce the wear and tear. He is a already a good CF. I think wherever he ends up in the out field he'll eventually win a Gold Glove.
And yes, I do think Bryce Harper will be the greatest player of all time, but that is for another thread.