Sorry OP, but just the indie scene alone on Wii U is so much better than you try to paint it.
In the first year, meaning through 2013? Yes, it was slow going and had it's issues. But through 2014, and especially within the last several months? It has literally become just as good and prolific, as far as steady flow of releases and quality of releases, on a weekly basis, as 3DS eShop. eShop on Wii U is kicking ass, honestly, and for those who haven't bothered to notice, more and more indie titles are announced as coming to eShop every month, sometimes every other week or more. And many of those are announced as only coming to Wii U (or only Wii U in addition to PC platforms). Meaning Wii U eShop is getting a substantial (IE significant) number of indie titles that are NOT coming to any Playstation or Xbox platforms. That alone is worth buying a Wii U over, in combination with Nintendo's own retail titles.
Yeah, the current third party situation on Wii U is pretty dismal, and it may or may not get better with improved system sales. Hell, companies like Ubisoft and Activision and EA themselves all stated quite plainly that their support of the console would pick back up when the console got a "large enough install base". So we'll either see if they're liars, or if they really do have business sense. It would certainly help if third parties would quit dumping half-baked or rushed content/ports onto Wii U. Even Sega, who has turned into a great partner for Nintendo, have dumped not one but too mediocre Sonic titles in the last two years onto Wii U. Games that COULD have been much better if they had only taken the time to polish them longer. But then again, I guess that's kind of Sega's MO these days anyway.
Regardless, does Wii U deserve to be "third/last"? In sales? Sure, I guess, whatever. But to me, and this isn't just bias talking, I think right now, when you combine the library of retail titles already out, including many of the really great Nintendo-made ones (two Mario games, Mario Kart, Smash, WW remake, Pikmin, Wii Sports, DKC, etc.), along with the great eShop digital content, and the fact that Wii U is the ONLY current gen console to offer totally FREE online play and also has 100% Wii backwards compatibility, and then look at the slate of great looking titles (retail and eShop) coming in 2015? I think Wii U makes a very strong case for itself as the "most bang for your buck" option of the three. And there is no way that Nintendo doesn't drop the price again in 2015 to spur sales and stay competitive. Meaning next year it'll offer all that at an even more affordable price.