I see this random rumour hasn't punched you in the face yet.
I had pretty much decided to move to the 3080ti because by the time it released I would have had around a year's use of my 3080 and resale would have made it feasible. However, having used the 3080 with the 48CX I'm not even sure an upgrade is required until the 40 series. The 3080 is a perfect match for this screen and perfectly pitched in general which is why it's constantly sold out, I actually wouldn't be surprised if we never see a 3080ti.
I agree regarding the 3090 also, I just can't see the attraction for gaming other than the fact it's actually available which probably tells it's own story.