You know that piracy doesn't kill systems, right? Remember that thread Rydian wrote on the myths of piracy? Yeah, you should read it sometime. A very small perfectly of people who mod their console use it for backup loaders, so....that's irrelevant. Doesn't change the fact that there are, unfortunately, people out there whose pride gets in the way. Homebrew wouldn't kill the system at all, it wouldn't even hurt it.
I'm going to have to disagree with the notion that homebrew would kill the Wii U, piracy never killed a single system.