So this is my current sim rig:

i7-7700K o/c @ 4.8 (Kaby Lake),  1TB SAMSUNG 960 PRO PCIe NVMe M.2 SSD, 32GB DDR4/3000MHz, ASUS ROG MAXIMUS IX HERO,  GeForce(R) GTX 1080 Ti Founders Edition

and I just ordered a ASUS GeForce RTX 3080 12GB TUF Gaming OC Graphics Card.

My hopes are that I will see good improvements in VR with my Reverb G2. With my current rig I can easily enjoy VR in XP11 in most areas as well as descent VR in MSFS with mid settings. So my hopes are to see a vast improvement in FPS with just a little bit of room to bump a setting up here and there. From everything that I've read the 3080 on my rig almost doubles FPS over the 1080Ti. If this is the case then that should buy me another 3 years or so until I will do a complete new system build.  

Anyone have any 1st hand knowledge on all of this hardware playing together for XPlane and MSFS?

Nah I've been waiting for almost two years for the 3080 and while I am buying it from a retail shop and not a scalper, the price is by far not msrp. This should keep me happy with my current build and in 3 years time or after a jump in the latest and greatest will be huge compared to what I'll be rocking now.