I think I bought my current PS3 Slim in 2011. Still works, but I'm kind of afraid of how quickly consoles from that gen are going to die off. SNES/Genesis was a super durable gen with consoles easily lasting all the way to today. N64 still runs well thanks to carts, but working PS1's and Saturns are pretty rare these days. Saturn is rare due a combination of poor sales and janky build quality. PS1 seems to be rare simply because everybody tossed out or sold their PS1 when PS2 arrived. Since PS2 plays PS1 games nobody really values the PS1 anymore, and a lot of them are left to rot in garages, attics, or sheds. Late model PS2s run really well thanks to the fact that they kept being made all the way into the PS3 gen, but those might start breaking in the next fifteen years. Gamecube runs pretty well to this day, seems to be everywhere in used shops, and has the Wii which runs it's games, so GC isn't in any danger at all.
But then there's the friggin PS3. Not the first console to have heat issues, but one that can definitely get them. Unlike the 360, PS3 is valued thanks to the unique library. I'm not sure what the average lifespan of a PS3 is, but I'd say we will be lucky to get 20 years even out of the slim models that came out in 2011 and saw relatively light play.
And PS4/XB1 gen? Yeah, good luck. Those things will be stupidly lucky to last 15 years after they leave the production line. This is why full backwards compatibility needs to be standard in consoles from here on out.
As for Switch, I think it'll be fine for three reasons. First off it's kinda last gen tech (like the Wii was a boosted GC), so it's not going to break as much as cutting edge technology. Second, there are going to be 100 million of the things out in the wild, so by the time the entire stock of Switch's stops working it will be at least two decades if not longer. Third, and most importantly Switch 2 is bound to be backwards compatible.
