I doubt this or other solutions built by a for-profit businesses in a seemingly open fashion will go far. Facebook is a different case and having some hands on experience with current players, believe them coming up with a better engineered solution.
As for the general concerns, i can add that it's not just 'i know JavaScript and don't want to learn anything else', but rather having some common ground while building products/services on the web. It's probably ok for a big company to support say 3 platforms (web, android & ios), but hardly an option for a small startup or a one man band. Now i'd be more than happy to just stick with web, or at least the solutions bringing the others closer to it (that's by the way where Titanium is pretty weak).
As for the general concerns, i can add that it's not just 'i know JavaScript and don't want to learn anything else', but rather having some common ground while building products/services on the web. It's probably ok for a big company to support say 3 platforms (web, android & ios), but hardly an option for a small startup or a one man band. Now i'd be more than happy to just stick with web, or at least the solutions bringing the others closer to it (that's by the way where Titanium is pretty weak).