In early May of this year, Ashley said:
Platforms like BB10, Tizen and Ubuntu Phone are pretty much completely dead by now, as far as I can tell.
The actual usage of export platforms is almost entirely shared between the exporters we already support, and the rest have vanishingly small usage. We'd like to trim dead or unused platforms from C3 where possible. I think we'll bring back the Chrome Web Store exporter because it had slightly less negligible usage and partly because it's pretty simple, but other than that I think it depends on user demand.
Is this likely to happen soon? The work to export to the Chrome Web Store shouldn't be that hard, and it looks like Chromebooks are still selling like hotcakes, especially to schools and students.
The Chrome Web Store looks very inviting, especially since you can create apps on a Chromebook. For $200 you can have a complete end-to-end development system. Create and Sell without ever leaving your one machine! Here's the Chrome Web Store: https://chrome.google.com/webstore/category/apps. And no, I don't work for Google. I don't work for anybody -- except me, and my boss is lazy!