B2G (ie FirefoxOS) has the same problem as Android as in they both have completely unique weird userland that has very little to do with your "normal" Linux userland, or anything else for that matter. I'm not really sure about Ubuntu phone OS, maybe it will have userland closer to their desktop variant. But on the other hand that won't help all that much as even Ubuntu desktop is veering away from what I'd consider the "standard" Linux distro.
Some people just would prefer having desktop-like OS on their phones with some mobile oriented apps, and that's what Maemo/N900 almost delivered. If Sailfish is anywhere close to that experience then I'll be a happy hacker. Admittedly commercial (mainstream) success probably requires bit more, but on the other hand I know non-linuxy people who were/are quite satisfied with their N9/N900.
Correct, I meant that FirefoxOS would be the open-source mainstream OS, not the linux mainstream OS. And I don't think that Ubuntu will be mainstream, because they don't have any partners while Mozilla have tons of partners and a schedule.
Some people just would prefer having desktop-like OS on their phones with some mobile oriented apps, and that's what Maemo/N900 almost delivered. If Sailfish is anywhere close to that experience then I'll be a happy hacker. Admittedly commercial (mainstream) success probably requires bit more, but on the other hand I know non-linuxy people who were/are quite satisfied with their N9/N900.