I can relate to how you feel Adam given that Wii U's sales are poor and haven't really improved. God knows what the answer is for Nintendo. I know this much, if they bow out of the console race, everyone will lose out imo, including Sony and MS.
People can't say that it's because they're bringing out Mario all the time surely!!! I'd like to see more 'mature' games on Nintendo consoles (not sure if 'mature' is the right word). We all know that it's not because Wii U is less powerful than PS4/X1 (look at PS2, 3DS). We all agree to an extent their games are some of the best around on any console. It's got lots of great games. Surely it's not because of the world of tablet devices (iPads etc)!!!
So, what's left? I don't fancy the rest of my days playing fps and driving games that's for sure. I know that's where Sony are hitting the big numbers in terms of consoles sold and audience captivation etc. They don't seem to cater for 'families' imo. Not sure about MS. It's only Nintendo that cater for families but for some daft reason, it's all about 'power' of a console, even if the other two gaming giants have some average at best games right now.
Baffling to say the least!!!