Yep, possibly -- though, obviously, users aren't likely to go for a phone that's _worse_ than iOS or Android, so I don't think carriers would screw things up too badly.
The main thing is B2G is COMPETITION!
Much in the same way that Firefox rocked the IE boat, B2G should hopefully offer a sound alternative to iOS/Android.
I should note that the browser on Boot2Gecko is really not related to Firefox on Linux at all, outside of using the same Gecko renderer underneath. B2G -- unlike Firefox -- doesn't require X, doesn't support extensions, and the browser chrome and all that is actually just a web app itself. So sure, it shares a renderer, but it's like saying that ChromeOS is powered by Safari.
I agonized about leaving in that 'lower tech' bit. Basically, B2G is built on the Android kernel. Chrome OS has a ton of security features that aren't present in Android. By 'lower tech', I mean that B2G won't have Chrome OS's verified boot, double sandbox, and other tweaks like that.
(Though I suppose B2G could have those eventually!)
It's odd that you would equate different design goals with being "lower tech". By the same criteria Android is a lower tech than Chrome OS.
Chrome OS was about building (a desktop computer) around the web as it exists today whereas B2G is about building (a mobile phone) around the web as it will (hopefully) exist in the future.
Hehe, well, I'm fairly sure that B2G and Chrome OS share more similarities than you grant them. They are both an attempt to build a cloud-based, web app-based thin client. The Chromebooks have 3G connectivity, don't forget -- and I'm sure there will be a B2G tablet, too (a Chrome OS tablet has been rumoured for a long time, as well).
I don't think you can compare Android to B2G. But yeah, perhaps I should say 'simplified' rather than 'low tech' :)
You seem to be implying that Chrome OS and B2G are really close, except B2G is missing a couple of things that Chrome has and is therefore "lower tech" or "simplified" but they simply have different design goals. Here's a list of APIs that B2G ships with that Chrome has no equivalent: https://wiki.mozilla.org/WebAPI