"What does then?" and "What causes a generation change?
When a company launches a successor that is on the market for at least 4 years, then that system is in a new generation. The first company to do this starts the next generation. That's the way it has always been.
"The Switch is considered Gen 9 because The WIi U was a massive bust."
The Switch is considered Gen 9, because it is the successor to both the Wii U and 3DS. Both were Generation 8 systems. The Gamecube was a massive bust and the Wii was still next gen. The Saturn was an even more massive bust and the Dreamcast was considered next gen. A failed system still counts as long as it is supported for a whole generation. That is the way it has always been.
"If they had back to back bust would the Switch have been Gen 10 then?"
The N64 and Gamecube were both failed systems, and they both counted for a whole generation. The Wii was still a Generation 7 system.
"Why is the X1X not considered a new generation?"
Because it has the same game library that the normal XBox1 does. It's just an upgrade like the DSi or New 3DS, and these have never caused a new generation.
Well written post that answered all my questions. Thank you. I hadn't considered the success of the N64 or gamecube before.
Do you think it is possible we will see generations with only one console? If one releases one every 4 years and the others every 7 or 8 we may end up with empty generations.
Anyways those we all quite helpful so thanks.
I think how we define both console and generation will likely change a lot in Generation 10 (i.e. PS6 generation). Nintendo and Microsoft are changing the console market in dramatic ways. Nintendo has their hybrid system which is clearly extremely successful. It's somewhat like both a home system and a handheld system, but really it's a new thing entirely. Microsoft is emphasizing Gamepass/xCloud and that is going to be somewhat successful if for no other reason than they just bought a bunch of game studios. I think the PS6 is going to have to be some kind of significant response to what either Nintendo or Microsoft is doing (or maybe both). I don't think the PS6 can just be another more powerful iteration like we got with PS1-PS5.
So, we are just going to have to wait and see how Generation 9 plays out, but it may be the last time we get traditional home consoles with games sold separately like Generations 2-8. So, this may not directly answer your question, but I'm just saying these kind of questions may be moot in a few years.