Either way, I don't think people buy their Wii U for these third-party titles we're missing out on. Most of us have a PS3 and/or a PC too, and we buy the Wii U for the amazing exclusives and occasionally for those ports that get better features on the Wii U port.
Those of us who don't own another console are usually not interested in most third-party games anyway. Is it so hard to believe not everyone likes AAA games? Most of them are overrated; graphics aren't everything. Nintendo games are fun.