Linux has had 20 years to prove itself, clearly it is not the right solution, or it would have made some traction at this point...
Yes . . . and it has. Hell, even demonstrated by the article in question here, or does "a big enough audience to justify day-one releases of AAA games" not count somehow?
Now, convincing me that an LCD touchscreen watch makes any sort of sense, that's another story. The Pebble is, generally, just everything a normal watch is with a little bit of extra on top. Anything that sacrifices outdoor legibility or battery life, however? Yeah, that's just companies desperately hunting around for the next big boom market because our insane society has decided that profits must always increase, and stability is somehow death.
Alas, electronics have not yet advanced to the point where it is reasonable to have one phone with support for all combinations of bands and technologies.
Right before LTE started rolling out, and before Nokia was forced to adopt chipsets approved for Windows Phone rather than using their own, the high-end Nokia devices developed had pentaband 3G and quadband 2G, which covered nearly everything (sure, some rural places in very few countries were CDMA, but this was already rare). It seemed then like other manufacturers might catch up. Unfortunately, with LTE we've re-fragmented, and manufacturers have used it as an excuse to go back to selling different models for different markets/carriers.