Wii u doomed?

I've been saying that the wii u wouldn't be very successful for a long time. After receiving a lot of hate from nintendo fan boys, it looks like I was actually correct. Now notice I said wii u, not nintendo. The company itself still has the ds and 3ds selling millions a year. I just want to know why people were so optimistic about the wii u? Didn't it seem obvious the freaking day it came out and gamers didn't seem to care much that this system would struggle with sales?