Maybe I'm whipping a dead horse here; BUT,
If X3 (or any new Sonar Xx) required a move to Win 8.x (with no backward compatibility) to give us the completely "rock solid", truly "Professional" DAW we all want/NEED, I'd have to suck it up and step up.
Would I "love" leaving my FW-1884 behind? Nope!
Would I jump on the "Touch" bandwagon (given my experience with the iPhone and the "touch" in general), I'd be cautious before spending a bundle a big screen to lay on the desktop; but I would have to check it out! (I bought a MCU and sent it back)
I'm sure that Win 8.1 is complicating development, or we would have "something".
Call it X2b or a "quick fix", "hot fix"; whatever.
Look at MS, Win 8 is about as HUGE a success as Vista, and heads are rolling.
In the meantime, I see X2a as a "professional" DAW.
I'm confident that there is a truly "Professional" DAW in the works...
T