How many of those are a) easily acquirable (not a rookie), willing to dh, c) still have a positive WAR after you take into account the big negative adjustment that DHs suffer?
Hell, of the guys available on the FA list next year, how many do you think would sign for less than Morales did per year to be a full time DH, and produce positive WAR? There's always gonna be guys who suddenly break out like LoMo, but that doesn't mean you'll be lucky enough to find one. We got really lucky with Smoak.
Of the guys on this team, Carrera MIGHT be able to put up positive WAR as a DH (with the added benefit of not seeing him throw to the wrong base).