Would be a nice move, but I don´t think they´ll do it. Isn´t it "too late" for that anyway? Considering the wii u is in its last year or so. When did they do it for the wii? I don´t remember honestly.
Maybe if the wii u can still be around when the NX launches, then maybe it would be a smart move if said console doesn´t have backwards compatibility, as they could still sell the wii u to new users and also sell lots of games with that new reprint and lower price.
Also, kind of off topic, but hasn´t Mario Tennis Ultra Smash sold nearly 100.000 copies in Japan alone? I thought it would sell less than that, maybe the game has sold better than expected? Anyone knows any official number for it? It has probably been a success even selling that much, because the game shouldn´t have been expensive to make, right?