I will not stop saying they are doomed.
Because I never started. I've always thought that the negativity within the gaming community is one of the biggest problems within the community. And when it comes to the Wii U, predicting its "doom" is just absurd, given that Nintendo has a massive pile of cash it sits on, plus a thriving handheld business, so it can absorb a few years of lacklustre sales, sell a comfortable 15-20 million in the worst case, and enter the next generation stronger. Nintendo has no motivation to kill the Wii U.
And the only real risk Vita comes with is Sony collapsing entirely... which is unlikely at worst. So long as Sony continues through the rest of the generation, Vita will continue with it.