First of all, AMD cards have been historically better suited for crypto mining(I had multiple AMD rigs in 2011) and yet still it did not drive the profits for AMD until 2017.
Nvidia's cash cow has been the workstation cards(Quattro) and Tesla computing cards(used just for processing not video) which carry much higher margins than the gaming chips while carrying the same architecture underneath.
Do you have a source for this statement? Crypto currency demand is not the "driver" of Nvidia profits.
It is the mining of crypto currency that anyone can do in their garage and maybe mine a bitcoin worth thousands or some other coin of the day.
Until then anyone doing cost/profit analysis would have gone with AMD cards.
When Bitcoin was worth mining on GPU (ie 2011), AMD cards were much better suited than Nvidia cards.
It was about 2x difference for cards costing the same amount.
While AI is great and all, it doesn't consume the sheer number of chips like the blockchain craze does. If history is any guide, once the block chain thing burns out or blows over, the number of available GPUs on the aftermarket is going to be pretty incredible.