Well, it appears that in both cases you were wrong. IE still has higher market share than Firefox, with Chrome being the clear leader it seems (though some usage stats may show otherwise).

Even today, Microsoft is far far more important than Google for their users - not necessarily developers. If Google disappeared tomorrow, yes it would make it a bit difficult to work in the short term, but people will manage. If Windows / Offce were to say, vanish tomorrow, then millions of businesses will just collapse and cannot function at all.