Hey congrats Jarhead, may your gaming go well. Good to see a lot of familiar names still posting here (I was on a long hiatus due to work and family. Are you using any VR headset yet ?
I wouldn't worry too much about being irrelevant with a RTX 2080 gpu and your CPU. The RTX 2080 is superb and there's always something new around the corner. You can update most of the components you need and probably even sell the 2080 pretty fast.
I just built a new system together myself after 10 years and just settled on a GTX 1660 Super but with a Ryzen 3600 CPU on sale and a nice mid tower from Phanteks (had to splurge a bit). Still gaming on 1080p/60Hz these days, but mostly RPGs or strategy games.