I'd love a tablet I could do real work on. The Surface comes closest with the fold-out keyboard, but it's a bit expensive. I live at the command line when I do dev, so installing something like Ubuntu would be ideal.
I'm not convinced this is a niche need, either. Manufacturers are just slow to catch up.
I have another rant in me about the entirety of tech chasing Joe Average, but that's for another day.