Looks bad for Wii U... if they drop it in 2015, that's not good at all.
The development process will be completely different for the Wii U than it will be for PS4 and Durango. Once it's no longer viable to downport everything for Wii U, they are going to drop it.
No. As I said, depends how wii u sells.
If it doesn't pick up, we may not even get the ports that are announced. Profitability on the system could be in question now, and that's always the bottom line answer. However, if it does pick up - and personally, I think it will once we hit some major Nintendo games - as long as that new % of consumer buys some third party games, the system will continue to get support. It just has to start selling more, and relatively soon.