In the newspeak section of 1984 it is implied that the regime eventually falls. But a permanent 1984 situation is probably worst next to annihilation.OTL is, as far as things go, middle-of-the-road. A lot of bad stuff happened, but a lot of good did, too.
The worst possible timeline is probably total nuclear annihilation or a 1984 situation. Even WMiT has a few halfway-decent human beings in it.