On the account of "whatever", nearly all modern games support memory profiling, which can be chosen based on which hardware is used. It could be that the new video card is simply not listed for automatic memory profiling. But that shouldn't take more than 5 mins to add, and deploy the patch. It won't need 2 years
Sorry, I just reread this post of yours and I think I might of misunderstood you. Do you mean that game devs could adjust current or make new profiles for current games now, to make use of the 16GB on the 6000 series now? As in now and not in the future? So instead of waiting for future games to make use of the 16gb, game devs could possibly adjust or make new profiles now to make use of the unused VRAM on the 6000 series 16gb? Is that what you meant? Because if that is what you meant, then I completely misunderstood you, my apologies for the misunderstanding then.
But if that is what you meant, then maybe? I am really not sure, your guess would be as good as mine. I am not sure if game devs can adjust current or create new profiles to take advantage of more, or all of the 16gb now. Your guess is as good as mine. But I am not sure that would benefit performance either, if games at Ultra quality already fit into 8gb and 10gb VRAM buffers. It is more about future games with higher quality textures and graphics etc. At least that is how it has always worked.
Anytime a GPU comes along with more VRAM than games require, it doesn't benefit them until games actually requite that extra VRAM organically, such as increased texture quality and details and such. It is not really about increasing FPS with more VRAM, it is about using highest settings without losing as much performance due to insufficient VRAM size.
So when games become prettier with higher res textures that are larger in size is a prime example, because texture quality is one of the least demanding settings FPS hit wise, but the most demanding VRAM usage wise. But other graphics settings also use VRAM as well, such as detail levels and draw distance etc. Just not nearly as much as textures do. And using higher res also increases the VRAM usage. But the future upcoming Direct Storage API might also have some performance benefits when used with a GPU with more VRAM, but that is just speculation on my part, so don't take that as fact. And with both next gen consoles that just released, we will likely see a sharp increase in game requirements as next gen games start releasing over the next year or two. So that extra VRAM could be made use of in some games by then. I am honestly not sure though, we will have to wait and see.
I just don't want to go to far into speculation of the 16gb potential future benefits, because I don't want to worry anyone with other GPUs unnecessarily. I am sure that 16gb will prove useful at higher res and settings sometime in the future, I just cant say when for certainty. Could be useful for some new games in 2 years, could be sooner, could be later. I honestly cant give you a date. But GPUs with less VRAM (eg: RTX 2080/3070/3080) could always just lower some settings and/or res to compensate, same as always, you lower visual fidelity to increase/restore performance.