Nvidia has indicated that they have plans of increasing supply in the second half of 2022. This is coincidentally when the 4000 series on the new 5nm node is predicted to release. They clearly plan on having a new product to sell to hedge against used 3000 series cards flooding the market. The current mining bubble is not guaranteed to last.Because they CAN'T.
They are selling everything as as fast as they can make it. GPUs are manufactured - not conjured by a wouldn't-it-be-nice whim.
FABs take years to build so more manufacturing capacity takes a while to bring online if future demand forecasts were wrong. Some mid level data analyst is more to blame than anyone - and it's not like anyone predicted the pandemic and all its fallout.
If all they cared about was getting more cards out regardless of any other market factors then they would probably have delayed that launch. But they already learned their lesson.