Ah, sorry, the comments weren't contiguous and so I missed that. I'm not sure what Microsoft acquisitions prove, but I'll continue thinking on it until enlightenment happens.
> More cynically, though, if Apple wanted to shut it down, there are easier ways they aren't above.
It sort of depends on the definition of "shut it down"(see Beats, Swell, FoundationDB, etc.). At minimum, Workflow goes away and rises from the ashes (with a new name) as an automation feature for a future version of iOS. Or, maybe it's just an acqui-hire[1] and they'll start over with a new codebase on something more integral to the OS.