16gb vram is already not enough for even medium path tracing apparently in Indiana Jones. 4080/5080 already has examples of running out of vram. With DLSS quality.
Yeah its an extreme example ( perhaps not if even medium PT doesnt work?), but this is always how it starts.
Hell, even at DLSS perf as per this.
Basically, in the long run a lot of these features are only useful at (increasingly) lower res or for 90 series which does get crappy vrams.
With 3080, i already don't use RT anymore. Much rather get higher fps.