Apple has to significantly invest to continue with Bootcamp, only to offer people Windows on ARM. Windows on ARM is actually a great product, but it's not what people use Bootcamp for. There's no value add here for Apple, and I simply can't see them doing it. Not even if they continue using AMD graphics in (some of) their machines. It's not worth any effort to run a platform that is still as niche as Windows on ARM.

The only way I see this happening if someone else would do the work. And that someone else would have to be Microsoft. Why? They're the only ones with an incentive to do it. ARM Macs would be a highly available, highly performant development platform for Windows on ARM. Apple could be accidentally solving a supply problem here for Microsoft - a supply of quality high performance ARM desktop hardware. Apple might even be inclined to work with Microsoft (or they might not), but even if unlikely the only way I see this play out is without Apple paying for any of the work.