Why focus on only one company when both MS and Sony have lost billions this gen? Having such a lop-sided argument does little to support your point.
It's true that E&D division pales in comparison to other divisions, but it's also the division with the most growth potential. This is why MS is investing in it, they know they can't rest on their OS, Office, and server business alone.
In my first post on this thread, I posted my reasons for both companies.
I said I think this will not happen, but if I was forced to choose, I think MSFT has the less to gain from being in this business and have by far the less investment; while Sony has invested a lot in first party teams.
A new generation for both MSFT and Sony means a huge investment, because their consumers expect too much from them. MSFT has already lowered our expectations with Kinect, and have shown that they are changing their direction, so the rumors of them launching a completely different device are not that random; but Sony continues to go in the bleeding tech direction, and some of their developers have already talked about next generation.
If a company would be forced to pull out from the market for financial reasons, then it obviously will be Sony, but if a company is willing to pull out because the benefit is just not there for them, and the returns are worse than the investment, then I think the closest is MSFT.
Said that, I have to repeat that I expect all three console makers to continue making consoles.