Is this a joke? Nintendo has just been lucky ONCE with the Wii, and you call that "doing so well" for 2 decades? Let's not forget they lost the console supremacy with the N64. That the Gamecube was a dead console when it came out. The only reason Nintendo is still alive nowadays is because of their portable consoles business. That's where they go unchallenged. And no, Sony is not very successful in that field, except in a few markets (the PSP(first one) did very well in Japan, and is still going on strong).

Their base "will always be there" is exactly the kind of statement that brought Sony down in the last generation. They thought they could sell PS3 at the price they wanted. Nintendo made the same mistake with the 3DS, by pricing it very high at launch timing and facing extremely disappointing sales until they cut the price and released more games for the system. It was one of the worst Nintendo launches EVER.

Even if the games come on WiiU, it's too late for Nintendo. There will be fantastic-looking games for the PS4 (and XBox one) which will catch the attention of gamers for a while. And the WiiU did not repeat the same thing as the Wii in the first place: most people dont "get" the concept, because it's not a very cool concept in the first place.

Another reason the WiiU is dead is that they have no 3rd party developer support. There's no games for it because most developers are working for other systems already. They don't bet on the WiiU. It will be obsolete in no time.