IMO, if it has a local runtime (not necessarily native, could be Java, or even just using a desktop version of Dalvik (the android runtime)), then it'll have a chance. If not, then not. The other thing I think it will _require_ for success is instant-on/spashtop functionality (blindingly fast boot, ability to hand off to other OSes, or even start them "in the background", or integrate with starting VMware or something). It'll also probably need to have wireless data support (HSPA, EVDO, WiMAX).

If it has those two things, and works on a convertible tablet netbook (like the Eee T90 or T101) then I'd be interested. Chrome OS with Dalvik on a T101 while on the go, and then Ubuntu when I need to do real work.