Bethesda/Gearbox point out why they don't support Wii U

[Metallicube]

This is kind of like asking why the Bloods don't support the Crips, or why the Athiets don't support the Theists.

They're completely different, it not outright opposing entities, with very different philosophies. The fact that Bethesda and Gearsbox are major third parties ALONE almost means by default that they won't support Nintendo..