I suppose it revolves around ones definition of Mobile
However Microsoft will not give in easily and it still has a stranglehold of the Business Market. My own feeling is that the Tablet will expand in power, enabling it to embrace Business Software and the Laptop will die.
The Phone based OSs are still in their infancy and there are real, inter iteration, compatibility issues. I don't believe that any Company, larger than a couple of dozen people, would roll one out to their whole workforce.
Bit like Bingalau on this one. I haven't a clue, because its like asking how long is a piece of string. The way technology and 'must have' as advanced, what we are seeing today might well be by its sell by date or obsolete by this time next year?.