I work from home (at times), and could probably at this point do it permanently given enough justification, as many people where I work do it. And I think it really depends on the employer; it took a while for them to get to this point, and a couple of the reasons were certain key people moving, and the fact that they have offices overseas, so one location just wasn't a viable argument anymore.
Of course, it also depends on the infrastructure and whether it will securely support remote work, and their IT department. Not big technical hurdles to cross, but if they're not already in place, that business hurdle can be insurmountable.