You think Microsoft will pull out of mobile?

After reading this:

And the comment ASUS made today about Windows RT not having any future.

You think there will be a point where investors say:

ENOUGH..we will not let you pour millions into mobile anymore. focus on business and desktops.

How long can they keep throwing around these budgets without profits. Sure, they have profits still, but they're coming from their business and desktop market. I know they have deep pockets, but they can't keep doing that forever.