Honestly if you've got a reasonably good card at the moment then you're better off waiting until the 30 series becomes more readily available.
There are a couple of reasons for this:
1. First runs of new products often encounter production problems, waiting a while until these problems are ironed out should give you a more reliable product in the long run.
2. The first versions of the drivers for a new GPU are often not particularly optimised, so having the new big thing right now may not be giving you the best performance that the card is capable of. Of course in time the drivers will improve and you'll reap the benefits - eventually.
And finally when it comes to driving sims there are not many that tax the GPU, outside of ACC that is. And as far as VR is concerned then bad performance mostly a case of the sim not being optimised for VR rather than any deficit of the GPU - at least if you've got a good last generation GPU that is.
As a 2080Ti owner I'm going to sit it out until the early part of next year before I make a move.