IIRC Microsoft purposely didn't do the numeric scheme because they would lave always been 1 behind Sony, and people are dumb.
Xbox 2 vs PS3 - > Xbox 4 vs PS5
People would have just assumed the Playstation was better based on name alone. Honestly they were probably right. They have to live with that decision though.
I have no idea what's going on with Nintendo. They have some absolute banger names but generally don't cash in with a follow up.
Have you looked recently? For the past few years buying new was actually cheaper than buying used, and factoring in manufacturer subsidized interest rates, the difference in the current market still makes new a viable option, unless you're looking at 10+ year old cars (which still start north of $10k these days).