I think there is an implied, "they won't" in there somewhere I'm sure of it.

Eh, it very well might be the best answer. It's a "Have you stopped beating your grandmother?" kind of question. Perhaps the famous Zen non-answer "Mu" would be better, but "No" is about as close an English equivalent as you'll get.

Q: How long until they ban VPNs?

A: No. Just no.

Then it is "can be answered negatively" instead. Simple as that.