There is definitely more than one way of rooting "fixed" device - after all all Android based phones have been rooted
Unfortunately economy works against this - one need to spend nontrivial effort to make such root feasible for "simple" users. Size of community usually helps. According to Raymonds: "given enough eyeballs, all bugs are shallow". There is simply not enough everything - people, interest, community to justify spending significant effort on this... I could count all developers who did something useful for the device using fingers on my hands (probably even on one hand). Not enough glory I guess - after all this is not iPhone and not even Kindle...
Currently I know of no way of breaking "fixed" firmware and I no of no efforts to change that.