1- 2 years of cross gen are ok! I don't want to get personal here but if someone is not able or willing to afford a new console 4 years into the gen (the PS5 without DD is 400€ here in europe, the same goes for the XSS) he/ she should really look for another hobby or a better job! Thank you! I do not buy any cross gen game beyond a certain point and if GTA VI was cross gen i would never get it and it probably would sell below expectations! 

Correct. I figured Skylanders and Disney Infinity were there but had no idea Rodea even existed.

Heck, when you consider how much Wii sold it's kind of sad that even GameCube didn't have a way worse post-replacement lineup. Twilight Princess was only day and date with Wii in Japan, coming out after the Wii version in all other regions. Madden NFL 08 didn't get particularly glowing reviews on GameCube but got some critical acclaim on Xbox 360 and PS3.

I think the reason GBA had a strong lineup is because it took until about 2006 for Nintendo to publicly acknowledge DS as the official successor to GBA. DS was risky since Game Boy Advance wasn't even 4 years old when DS launched, and it was one of the fastest-selling platforms ever. But DS made a big impact with its software and the rest is history.

I saw one of your earlier posts highlighting Xbox 360 and yes Xbox 360 had a strong lineup even after it was replaced. Xbox was nervous about Xbox One even after some course correcting and it wouldn't make sense to have 360 software dry up to nothing as early as late 2013 to early 2014. 

After doing a little more digging, Wii also got FIFA in 2013 and 2014, and it's last game was actually in 2020; a cool little retro-style GTA spoof called Shakedown Hawaii that I am actually considering getting now, cos it looks kinda fun plus the novelty of it being the final Wii game.

It did fall off quite steeply, even before it was replaced really, but I'd still say its post-launch support was better than Gamecube, or N64/Wii U.

Nintendo platforms tend to be retired in fairly short order; I expect Switch will probably be the new post-replacement champ for them, as while I don't expect its crossgen period to be nearly as extensive as PS4/XBO due to its harsher power limitations, its massive install base means it will likely still be getting lots of smaller games for years after the successor hits.

They're happy with their old consoles and don't find it necessary to upgrade yet. Why do you even care?

All Nintendo Handhelds say No! Nes had ~ 10 years. It was the SNES, the N64 and the WiiU that got axed right after tge sucessor came out.

If people are happy with their old systems its absolutley ok but then they will not be able to play the latest games, as easy as that! There is a reason GTAVI is current gen only! If we take everyone with us then why not release GTAVI on PS3 and Xbox 360? Or even PS2/ GCN and Xbox? Answer: Because tech moves on! Its so redicolous that the Xbox SX(/SS!!!) is getting GTAVI despite its tiny HW base of 33 million (=N64!!), but Rockstar refuses to release GTAV on the Switch (150 million+). I do not say anything when crapware like FIFA wich is basically the same game every year released on the Mega Drive if they want, but games like Horizon, Halo, Gears, GT7... have to be current gen only!

If you buy a new car, are you willing to sacrifice power only because they use the same engine like in a 10 years old model?

Well yeah if they want to play next gen exclusives then they'll need to upgrade. It's just how it is every gen, but the key difference this time is prices are much higher than what console gamers are used to, and the economy is weaker.

I wish I knew why Rockstar refuses to port GTA5 to Switch, it's one of these questions that don't seem to have a good answer, like Vanillaware's refusal to put their games on PC lol. But putting this aside, it's not at all ridiculous that Xbox continues to get a strong 3rd party support. Scaling your game to work on Xbox consoles is very cheap and easy, and the target isn't Xbox consoles alone, but every system close enough to their specs. Switch is too underpowered and will require extra development time and costs for most AA/AAA games to work on it. It's just not deemed cost-effective by many publishers to port every game on it. Series S and comparable PC's (and potentially Switch 2 as well) are above the minimum specs required to run most AA/AAA games (so far) acceptably. 

Whatever the reason, this gen's games including exclusives are running just fine on a SteamDeck which is more or less a portable PS4. One of the few exceptions is Monster Hunter Wilds (which isn't even a great looking game so I don't know wtf is going on). I no longer think the problem is old console holding back the current generation, it's more an issue of developers failing to make use of current gen hardware to create things that are difficult to downscale to systems as old and weak as a PS4.

All Nintendo Handhelds say No! Nes had ~ 10 years. It was the SNES, the N64 and the WiiU that got axed right after tge sucessor came out.