You'll be worse than second best well within a couple of years though. This whole launch seems rushed to me, like they just had to get these cards out there. Waiting until next year would have seemed more logical, given there are zero games to take advantage of RTX features yet. If they'd bided their time, they could have released alongside several titles next year. So why NOW? I think it might point towards overall strategy and a view to release 7nm/10nm cards next year at some point... it might not be until towards the end of 2019, but still, it feels like they HAD to get the 20xx out now for some reason. At the same time though, they had to know sales would be slow and the 1080Ti stock would have to be cleared out before 20xx could really get a foothold.
So on one hand it almost feels strategic, on the other it's like they're making it up as they go lol! Regardless, the 2080Ti isn't going to be the best for that long, and absolutely nowhere near as long as the 1080Ti held that crown!
I've been deliberating myself between 2080 and 2080Ti... and while the raw power of the Ti is certainly appealing, it IS worse value than the 2080, and there's still huge questions as to whether it's even worth it regards the RTX features. At 4K, if you need an absolute powerhouse and won't settle for less, it's the obvious choice if you can afford it. I do worry within a relatively short period of time though, that its second hand value will plummet as and when new GPUs arrive or are even announced. Overall, I think most people are just better off with a 1080Ti and waiting. They won't be missing much.