Tbh you're going to get more current performance out of a Radeon VII than a 2080 if you're putting it under water, and it's not any more expensive - cheaper in most cases. Long term I'd expect it to age significantly better, as is usually the case.
With NVIDIA finally caving and supporting adaptive sync, staying hitched to monitors with a discrete Gsync controller doesn't seem very prudent. I'd ditch it and then you can move between AMD and NVIDIA (and soon Intel), depending on budget and what's on the market at the time. Discrete Gsync is dead long term, whatever NVIDIA say.