IndustryGamers: We recently listed the top five things working for the Wii U so far. That's all well and good, but not everything is looking up for the Wii U. There are definitely some challenges for a system that's trying to replicate the sales success of its predecessor and it won't be easy. This goes beyond the lack of DVD/Blu-ray support and the fact that it doesn't upscale Wii games to HD. Here are five potential pitfalls for the Wii U's attempted ascendance.