with the holes this team has, Plouffe is pretty far down on my list of things that need "fixing" this offseason. At worst he's earned his job for at least the first half of next year, and at best, he's a late bloomer that is going to be a very valuable asset for a while. It's quite possible that starting next year he's Danny Valencia part 2, but I don't think the front office can really worry about this for the time being.
You can statistically fluke your way to a high BA for a few months. It seems less likely that you can fake your way to 10 HRs in 22 games or whatever his crazy tear consisted of. A home run just isn't an accident. He clearly has something. Even if he were half the player he was during June and July he'd still be a permanent solution at 3B.
When a high draft pick starts producing incredible power numbers in the majors, it isn't a fluke