Just a general comment here that doubling the VRAM on every one of the RTX 30-series GPUs from the 3080 down isn't particularly difficult, and it gives Nvidia (and its partners) an easy way to increase pricing on each card. We'll have to see what happens, but RTX 3080 Ti with 20GB at $1000 is 43% more than the 3080 10GB, and will probably be about 5-10 percent faster at best (3090 is 10-15% faster). 3070 Ti with 16GB might end up at the same $700 (maybe $600-$700) asking price of the 3080, because MOAR RAM! But it will most likely be slower in the majority of games, unless you're running one of the rare games that actually needs more than 10GB. 3060 Ti ends up in an odd spot -- probably won't get a 16GB version, so you'll have 12GB 3060 models that have less memory bandwidth but more memory, and probably fewer GPU cores as well. If they cost $350-$400, I'd take the bandwidth and GPU cores of the 3060 Ti over more RAM capacity.
The big issue is going to be supply. Nvidia is still having difficulty keeping up with demand for Ampere GPUs. Is there enough GDDR6 and GDDR6X to go around for all the doubled VRAM models? GDDR6 is probably okay, but GDDR6X only comes from Micron, and 3080/3090 are the only GPUs that use it, so Nvidia needs to be very careful about how much memory it orders. Not enough and it can't do 3080, never mind 3080 Ti and 3090. Too much and it would have to make everything into a 3080 Ti/3090 to get rid of the excess. Actually, 3060 with 12GB of GDDR6X would be an interesting alternative. I don't know if the GA104/GA106 GPUs support GDDR6X, though. Would love to see a 12GB GDDR6X 192-bit bus card for around $300-$350, but that's probably a pipe dream.