Yes.
Honestly, every time I use a tablet the first thing on my mind is the firmware invading my privacy. The next thing though is input devices. (I'll probably end up flashing cyanogen mod.)
Input devices, for most users, and even most developers, are something assumed. For desktop it's keyboard and mouse, for laptop it's keyboard and some kind of mouse-like input device. For tablets it's touch or buttons. For phones it's touch or buttons. (I don't think most tablets that use buttons, like e-readers, are open for development. Correct me if I'm wrong though.)
I'm going to reiterate what I've already said before, touch sucks as a universal interface. [0] So my question ends up being "What peripherals make sense for a mobile device?". Recently I received a tiny bluetooth keyboard to type on my Nexus 7. That's a step in the right direction, as typing things out with the on-screen keyboard is painful and awkward. (And since a stylus is too slow, smudges up the display...)
For a pointer device I am using a capacitive stylus. My current hypothesis is that the dominant paradigm for tablets will be keyboard and pen. Though for delicate tasks such as drawing, a capacitive stylus leaves much to be desired. IMO touch should be, in the majority of cases, a fallback interface for people without peripherals. For most applications it doesn't beat traditional input devices such as pens keyboards and mice of one sort or another.