I think it's worth pointing out that a significant percent of used game sales go towards purchasing new games. Take away used games and some people would buy significantly fewer new games.
I agree it could have been significantly more powerful, but I don't think it will matter much in the long run. Even if the power gap is preventing third party ports, I suspect other factors such as poor sales would also keep the Wii U from getting third party ports. As long as I get a handful of great first party games a year, I'll be content.