My 5 cent:
CX for touring: if it fits and is comfortable for you: absolutely yes, why not?
Carbon frame for touring: from my point of view absolutely not. I need a bike which I can slam onto the back of a pickup, into an aircraft, train, bog, what have ya. So robustness is important for me on tour.
And repairability on the road, but that does not apply so much to the frame. More to anything else (brakes, chain, gears...)
I know you can weld a steel frame, but it is not so easy if you are all by yourself in the woods somewhere...