With most of your points you try to say that you think less AAA games which release on console will also come to PC? Right now it looks like exactly the opposite, that more and more console AAA games will also release on PC and the similar architecture will only help.
Sure, people on PC pay less for games but pretty much every sale is a digital copy so that they don't need to sell the game for the same price. Developers sell their games much cheaper on PC because they can still earn decent money with it and when the console market will be almost only digital, you will get deals on consoles also much earlier so that the price discrepancy will be only as big as long as retail is still king for console games.
And as long as these games will still come to PC and as long as modders will still mod the heck out of some games, PC gaming enthusiasts will still invest in gaming PCs.
