XBOX
WII
PS5
How low do they fall to? And how long does it take?
For instance, PC games come out at about $40-50, but usually fall to $30 in a short time. And even fall to $10-20 after 1-2 years
Well, for a start, there hasn't been a Wii or Wii U console on sale for years... I think you mean the Switch.
I wouldn't say prices are directly comparable (it's not uncommon to see $60 console and PC games when new), but you do see steep price drops depending on the game and how long it has been since launch.
Assassin's Creed Valhalla for PS4/PS5 is 60 percent off at the PlayStation Store several months after release, but a hot and more recent game like
Elden Ring is still full price at last check.
Really, don't worry about game pricing. You buy a console for other reasons — because the overall cost is lower than a good gaming PC, for instance, or because you'd rather play in the living room than isolate yourself in a den. Me, I originally got into consoles to see what I was missing, but I've kept with them in part because it saves me from being chained to Windows PCs; I'm free to use a Mac.