That is not what GP was saying. They were saying that a foundation model company would say "$CURRENT_MODEL is so good that it is no use training $NEXT_MODEL right now", which I don't think is the current stance of any of those companies.

Given that they are all constantly spending money on R&D for the next model, it does not really matter how long they get to offer some of the older models. The massive R&D spend is still incurred all the time.