The Wii U is powerful enough to run the HD games Nintendo is making (both
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,c)}p.removeChild(t)}}catch(u){}}()/* ]]> */) - power is not the reason 3rd parties won't develop for Nintendo. Hint: It has more to do with Nintendo not bending over backwards to please them, or allowing systems like EA's Origin on their consoles. Nintendo makes their consoles to fit the games Nintendo wants to make, they don't make hardware catered to 3rd parties to develop on.
The Wii has a DVD player and the Wii U is using BluRays, both drives are modified though so they don't play anything but game discs - I assume this was to get around licensing fees to lower cost of the machine.
They are slowly changing - they have gotten rid of friend codes and have switched over to an account based system like everyone else (Nintendo Network IDs), they also merged their handheld and console accounts. This paves the way for your games to be account based instead of tied to the console. Unfortunately Nintendo is not a tech giant like Microsoft or Sony and they have probably had to recently hire people to slowly implement a system like PSN and Xbox Live. It's going to continue happening slowly though. Until then it's a pretty backwards system that is rooted in Nintendo's desire to keep their consoles and games a safe place for children and families.