Who knows, they might continue to offer an Intel MBP for years to come, or even add Windows ARM support if it commands enough demand. The other manufacturers have no mote here.
Windows arm is not real windows. It's not a substitute. Apple might command it's developers like a herd, moving them to whatever fancy new thing they make but windows is much more fragmented with 20+ years of backwards compatibility and tons of unmaintained software that won't be magically ported.
Current Windows on ARM seems promising with its x86 emulation so far, but still has a lot of room for improvement. Combined with the Windows 10 S sandboxing old windows apps I can see Microsoft catching up again in a few years once we have more widely available high power ARM processors.
In IT though, I don't expect any changes over to ARM hardware for another decade. I know where I work we have plenty of legacy cruft which would probably run into some weird edge cases if emulated on ARM.
