I think it's pretty fair to say that our batting is far weaker than our bowling at present (Clarke excluded) so IMO picking a batsman-keeper is the way to go (even if it isn't ideal).
Wade makes runs - be it under pressure or cashing in after a good start, I'd want Wade there to put runs on the board ahead of one-ton Paine and Haddin. Yes, it means Nathan Lyon gets screwed over behind the stumps, but odds are the quicks will sooner create 25 chances in a game that the batting unit will consistently get to 5/300.
Wade's a rubbish keeper, but he can improve - and it sounds like he is actively trying to. In time he should develop as a serviceable gloveman, who is more than handy with the bat.
Is he a long-term 6? Probably not. But if we want an all-rounder in the side we don't exactly have much choice. None of the batsmen who can bowl are legitimate top 6 options - Wade is far closer to that. Maxwell has no temperament, Smith's technique is rubbish, Henriques is just plain mediocre and Mitch Marsh is either underperforming or injured. Not much choice with Watson and Clarke both not bowling.