I think that the economy of scale will make higher performance phones a frugal possibility in near future. The trend has always been moving that way. So why bother developing an OS that will probably be obsolescent in a matter of couple years? Even if it is presented as a reasonable alternative, the fashion factor of other operating systems and the combined marketing efforts of parent companies will make Firefox OS a joke. I know that geeks might get excited at open-source anything, but most people really, truly, and honestly Do Not Care.