Believe me, I am a HUGE believer in using the chalkboard, but we're getting a lot more non-traditional students that like the convenience of being able to look at their lectures outside of the classroom (yes, I know, that is not ideal for classroom discussions). I create lectures ahead of time, but don't display them, I simply work through them on the board. The way I plan to use the tablet is the same. I'd simply use it as a "computerized chalkboard" not as a powerpoint displayer that I can write on. Would you object to this? Essentially, the only difference would be that I don't walk back and forth in front of the class with my back turned to them. I do everything by hand, but while facing the class and looking them in the eye.
The other advantage is that if I do use technology (I'd use Matlab A LOT in linear algebra to demonstrate difficult examples), it doesn't feel so awkward. Right now, I stop lecturing, pull the screen down, turn on the projector, wait for it to warm up, login to the computer (or turn it on), then do an example. Then, if I wanna write something on the small remaining portion of the board, I can, but I really must put the screen back up and turn the projector off if I want to go back to lecturing.
So, the way I describe it above, does that seem a bit more interesting to you?