While Apple is introducing their own silicon, Intel Macs aren't going away - I expect my 2018 MacBook Pro to last many years and it has an Intel processor. And it is likely that Apple will continue with Intel processors along side its in-house silicon for a number of years. From the Apple announcement: "Apple will continue to support and release new versions of macOS for Intel-based Macs for years to come, and has exciting new Intel-based Macs in development." And of course Bootcamp isn't virtualization, it's running Windows natively on the hardware.
But more importantly, Apple has already stated Parallels, one of the companies that makes virtualization software for the Mac, is already at work on a version that will run on the new silicon:
https://www.pcmag.com/news/arm-based-macs-wont-support-boot-camp-apple-confirms
Microsoft also has an ARM based version of Windows 10, so it is possible.
But still, the real answer is vendors need to keep their software updated or not advertise that they have a MacOS version available.
Tony