Of course, but aren't there more pluses with him at 3B than minuses with Kemp in LF in 2019 when you're actually trying to contend?
Ideally (IMO), you land Frazier now for something like 3/$36 million, eat money and unload Kemp at some point prior to next winter, add one of Jones or McCutchen on a similar 3 year deal, and hold onto all the prospects to address other needs and injuries or a TOR arm. Sure it's a pie in the sky hope, but if Riley takes another step forward you package him with Soroka and Allard and get an Archer or Fulmer to front the staff. I just don't think you get a Jones or McCutchen on a reasonable enough deal.
If you're picturing a 3 year window while you still have Freeman and Inciarte, you're looking at 2019-2021. During that period you'd control Freddie, Ender, Albies, Swanson, Acuna, Folty, Newcomb, Gohara, and Wright, plus the additions of Frazier, Jones/McCutchen, and Archer/Fulmer.
Of course I'd love to do it all on the cheap. Houston's still looking to upgrade their pen. I'd call them and offer Vizcaino for Colin Moran. Then Moran plays 3B starting in 2018, Camargo becomes your cheap super-sub (especially in case Swanson continues to struggle), and Riley replaces the Markakis/Kemp platoon in LF in 2019. That leaves you the money you would've spent on a 3B this winter to use to get out from under Kemp.