A genuine question: Since this is essentially a talent acquisition, why doesn't someone else continue running the product? or perhaps sell it off to another company?
"This is an important milestone for Facebook because it's the first time we've ever acquired a product and company with so many users. We don't plan on doing many more of these, if any at all" [1]
And Alex, just checked out Bitgym - great idea. Will be trying it next time I'm on the treadmill!
Particularly that last piece because it opens up the market to be commoditized. The secret sauce of getting a web-based viewer of a remote iPhone Simulator session is now available for anyone. And now a bunch of competing services will likely pop up (because all the hard work is done) and that means a price war. The consumers of these services are ultimately the big winner.
I hope more deals like this happen.