Unfortunately we need to be careful what we wish for. As AI processing becomes more and more popular, if a card like the RTX 4070 had 20 GB vram they would probably all be snatched up by companies to use for AI processing on the cheap, and suddenly 4070 and higher all go for $2000 like the mining craze all over again.
Well there’s still only a finite number of them being fabbed and manufactured. Whether they custom order them in bulk or not it still reduces available supply for other customers.