The people who think that high end GPUs don't last for ~5 years (really it's 6) do not know what they are talking about. 6 years is likely too low. If the cooling is good and they don't fail early, most of these GPUs could still keep going past 6 years.

I'm convinced that anything with more than 80gb of VRAM will be worth it for closer to 10 years at this point.