If somebody says "X has money and an army of lawyers" the implication is they are going to beat the case, Microsoft didn't, they were slapped with the largest fine ever at the time ($794 million USD). They are fine despite the inability of lawyers and prep time to deliver victory, not because of it. No guarantees FB will fare better (or worse).
They're not going to withdraw. Best-case scenario, they stay in the EU but stop abusing users' data there so much, but still make a profic. Worst-case scenario, they're able to weasle their way out of having to change anything.
