I mean..that's an opinion...sure
Harper is a below average RF and is becoming an above average fielding 1B.
And he's likely to stay healthier at 1B.
But let's screw it up to do what?
Turner is more complicated, he hasn't lost much speed, but he's average at best at SS and will start to lose range in a year or two.
Stott is a golden glove caliber 2B but average at SS.
Sosa isn't the answer, and at 29 I'd use him as trade bait this winter.
The guys to watch are Miller, who is still at SS (eventually will have to move to 3B) and maybe a year away and Caba, who is an elite fielding SS but 2-3 years away. The wildcard is Rincon, who is also a top fielder, and has a chance to be a hitter but is also years away.
One of these situations where you don't try to fix it, just let your prospects marinate and make a move when they show they're ready. But it's not a big enough problem right now that it should be something you want to mess with.