Yes but that is unproven potential which is simply conjecture at this point.
Has facebook WOWed you with their search function, ever?
That's kind of my position too. If they can do it, great for them, but I'll believe it when I see it.
Microsoft has been trying to do search in one form or another for as long as Google (since 1998, MSN search, and then all the rebranded successors) and what they've got for their trouble is billions in losses.
It's kind of like saying that Facebook can just make a smartphone and compete with Apple. Well, if they can, great for them, but I'll believe it when I see it because it's not quite that easy...