Given the Nexus 6, I actually think this is too small. If I'm going to have a six inch phone, I'd prefer a tablet that is upwards of 12". I think huge tablets are currently an unexplored niche that could kick off just like big phones did.
Huge tablets aren't exactly an unexplored niche; the Galaxy Note Pro 12.2 and Microsoft Surface, and even a few bigger tablets, do exist.
I guess I unintentionally excluded the Surface Pro 3 since it's so much more than just a tablet.