You may want to hold out for HDMI2.1 receivers to maximize future proofing.
I've held out now for about 5 years from being an early adopter of OLED tvs primarily for cost but also to wait for the tech to develop. I can't hold out for more future tech specs. It changes too often.
Our aged system has lasted us 15 years at this point.
For our purposes i don't see HDMI 2.1 bringing any benefit. Lots of neat articles talking about the non hype.https://www.cnet.com/news/hdmi-2-1-what-you-need-to-know/
This one is a bit older but still fairly relevant on the concept of adopting the newest marketing fads including 4k tv:https://www.cnet.com/news/why-ultra-hd-4k-tvs-are-still-stupid/
Incidentally, the HT room hasn't changed in anyway. We sit about 11 feet back from a space that could house a 77" screen at max with room for speakers on the sides and a centre underneath.
Sometimes people could sit as close as 4 feet but that's usually kids and its rare.
As such, 4k is the max visual requirement for which we still don't get any content yet to even display. We only have one bluray (non 4k) in the house. That will go upstairs and if necessary i'll get a 4k player for the HT room but that is unlikely.
Bell satellite doesn't have 4k content yet in our province. I would have to get a new receiver to start (which they aren't selling here yet). New tech like 10k tv and such is SO far away, i'll likely be dead before it is mainstream enough for me to care, if i care if i lived that long.