Core argument: at least one "dead" console (i.e. no longer officially supported by their primary manufacturer) will have been given new life by a wave of indie development centered on that console, as a way of bringing back old-school gaming and physical media and capitalizing on how many old consoles there still are that still work at least somewhat
I've considered this for probably a decade now, but there seems to be enough interest lately that some people want to RETVRN TO TRADITION...al gaming, and yet we have all these consoles right there, ready to develop for.
Homebrews have been a thing for a long time, but they've never really been a big enough phenomenon to revive old consoles. The closest I can think of was when there was something like a dozen new Dreamcast games coming out in 2007 (IIRC). That was neat, but also pre-retro gaming revival, so it flew under the radar except as a quirky joke. Whereas if that happened nowadays, I don't doubt it'd get a lot of press.
Edit: I'm also aware of a pretty steady release of homebrews for the Atari 2600, and I mentioned Brazil and their relationship with the Master System/Genesis down below
Console gaming tradition has long been that once a new console releases, old consoles are no longer viable platforms. Even though there were 155 million+ PS2s sold by 2013, it was seen as a complete faux pas to make a new PS2 game any year after 2006, to the point it's still seen as a joke. "This is a Nintendo 64 game that released in 2004." To a certain generation, you just immediately start laughing on hearing that. But I wonder if, to a younger generation, there'll be a point where that's not at all odd. In fact some young'uns might even start wondering why we thought it was normal to just totally discard an old console just because a later one came out (especially for consoles that lacked backwards compatibility). That sort of technological progression may have been important context at the time, but looking back, it does seem a bit silly.
After all, we've cycled through "2D gaming is obsolete, only 3D games are good" to "low poly 3D is terrible, high-definition 3D is for Real Menā¢" to "Anything brightly colored is gay, real games use realistic brown and gray and feel miserable and misanthropic" and then "Actually 2D pixel art was great and early 3D is ugly and outdated" and now "Actually low poly 3D was great too"
I've seen plenty of people note that we got 3 GTAs on the PS2 and subsequently 1 GTA across 3 PlayStations, often exalting the atmosphere of those PS2-era GTA games. And I'm just here wondering "Why not get a team together to make a new PS2-style GTA game? Heck, even release a version for the PS2"
Would that be profitable? Hard to say. It's always a crapshoot involving video games.
But, it can't be anywhere near as unprofitable as HD game development.
So to the central point
By 2030 at least, I do think those crazy Zoomers will start busting out homebrew development kits and getting together to make games for "dead" consoles on a scale large enough that it could be said that some of them like the SNES, PS1, OGXbox, GameBoy and Advance and DSes, even rare ones like the 3DO and whatnot are at least semi-"active" and supported again.
(Pure showerthought: imagine if Sega came out of retirement to offer official support for a new wave of Dreamcast homebrews, even if not actually manufacturing new hardware)
(Other showerthought: on the topic of Sega and hardware support long after its heyday, consider Brazil and how they've kept the Master System and Mega Drive alive for literally decades)
Evidence: reaction against Sony phasing out physical media, increased Zoomer/Alpha Genner interest in old-school gaming and aesthetics, Millennial nostalgia, the hundreds of millions of old consoles still out in the wild; homebrew game development already advanced enough to allow for it
Date: roughly 2030