The lifespan of a Mac is a good 5 years even for professionals. There will be Intel Macs running this legacy x86 software in 2026.
By that time I would truly hope that most of that software was available in ARM form, even the most laggard software team should have achieved that.
If not, then the Apple ARM chips of 2025 will likely run the software in emulation at even better performance than today's emulation, and it will likely exceed today's native performance.
So we now are down to a very small set of performance critical, unmaintained x86 Apple MacOS software. I guess these users will have to get a few spare machines whilst they can.