There's plenty of room for optimization in recent games, meaning that new games can be made to run on the hardware we already own for years to come.
There is (still) a unusually high profit margin in key products like graphics cards, meaning that a price increase on some of the input components can most likely be absorbed with little-to-no change in product MSRP.
PC gaming can survive this just fine, certainly long enough for manufacturing in non-tariff countries to catch up.