O.K. I'll bite.
If the tree falls, and no one is around to see or hear it, has it fallen at all?
Schroder's cat syndrome.
But I agree with MBs statement that the tree will fall in the direction of the remaining roots. Or not. A tree may remain upright for many years after suffering such a loss of support.
Such is the reality of us, tree health professionals, we often get asked to determine the exact extent of liability or risk.
Funny you should ask this at this time. Right now, I have condemned a tree and the homeowner is asking me how long he has exactly until the tree fails. He is hoping that the tree will stay upright until spring.
I cannot make a prophesy with such crucial elements to factor in. Such as the garage being crushed, or personal injury.