I have yet to see a collapse on any Nvidia card since the 1080ti days. They hold very well. Mostly because its just incremental fps increases. 2080ti saw almost no increase but RT introduced, 3080ti bumped that up, and GPU shortages kept the 20x series riding high on the resale market.
Even if GPU supply is bountiful, I think the trend will hold simply due to the costs of the current gen (40xx once its released)