It's the beginning of the end of an era. I'm reminded of how when the PowerPC-to-Intel transition occurred in 2006, the next Mac OS X version to come out the following year, 10.5 Leopard, was universal and could run on both PowerPC and Intel Macs. But iLife '08 and '09 both had some features that required Intel Macs (like working with AVCHD video, or GarageBand's "Learn To Play" interactive lessons). And of course in 2009, about three years after the Intel transition was complete, Mac OS X 10.6 Snow Leopard came out as the first Intel-only version of the OS.
But I'm glad I sprung for an M1 MacBook Air when I was ready to buy a new Mac laptop that could run Mac OS 11 Big Sur, after hearing how they were way more fast and powerful than their Intel predecessors, and how they cost less than the 13" Intel MacBook Pros still on the market at the time (the Mac laptop type I was initially eyeing, as I was waiting to eventually get a more beefed-up "M1X" Mac Mini or whatever as my first Apple Silicon Mac to replace my 2012 i7 Mini), and because Intel Mac support would be dwindling and Apple Silicon Mac support would be increasing. And once I saw I could even run a Windows XP virtual machine on UTM for running old PC games on the M1 Macs, I was sold (especially because at next year's Anthro New England I may be hosting a panel about 1990s PC games for kids and may demonstrate several such games for them.) So at least I'll still have a Mac that can run Mac OS 12 Monterey with all the features available (not that I'll really use most of them; I'm a little too old-school for them.) And then some time next year I'll still get a new Apple Silicon Mac desktop to replace said 2012 Mini (either the aforementioned "M1X" Mac Mini or the rumored Mac Pro Cube). But I'll still want to keep the 2012 i7 Mac Mini for my collection of older Macs!