Seems like everything people say Wii U can or will do xb one and PS4 can and will also do. Price cuts, exciting games etc, Wii U isn't operating in it's own bubble.
With games like SSB people say gamers wait to buy the console until SSB comes out, but surely there is a large cross over between MK8 players and SSB.
You also have to consider how much Wii really expanded the fanbase for these iconic franchises. How much of an attitude of seen one Mk / SSB seen 'em all is out there among the GC buyers of those franchises and the franchise virgins who only came on board with Wii? If VGC is to be believed SSB only expanded by about 5 million units between GC and Wii, which means not much expansion compared to Wii vs GC install base. And we also know that games like MK and SSB sell big on a relatively small install base, while not doing all that much to expand the install base. SSB may sell 6 million plus units, but that will only help get Wii U to GC level sales. For it to actually drive Wii U sales beyond GC it would need to sell 10-12 million.
Other games from Nintendo will come and they will do well, but that happened with GC too. Other games come to other platforms and they do well also.
On price, Wii U is already the cheapest console on the market, and the other consoles will cut price too. MS and Sony have more head room for price reductions so even if Wii U drops in price by $50 next year it is guaranteed Xb one will do the same, if not $100 and PS4 will almost certainly get a $50 shave.
A game changer is what Nintendo needs to bloom late. Not standard tactics of more Nintendo games from the same franchises and price cuts. Perhaps there is something out there that will change the game but I haven't seen it.
Amiibo appeals to the core nintendo fanbase, I'm not sure it appeals more broadly than that.
Fact is Nintendo's core fanbase is in the 20 millions, and so is Xbox's. So far there is nothing coming that I can see which significantly appeals to the swing market.
I think today's console demographic has a lot of fathers who are in their late 20s and early 30s and old goats like me. It is them, not their kids, who make the console decision now. If they can afford it they buy their console plus the Nintendo one for the kids, but most families can't afford it, or don't feel it's justified, and so the dad makes the choice, and most of those dads were teen gamers in the PS2 era. So they will mostly go with PS4 and keep family unity by buying one or two kiddie games.
This is not a recipe for a Wii U late bloom.