Does the community think the same? How can a software developer take advantage of such a huge transition?
When the iPhone came out with "Web apps only" many OS X developers got into jailbreaking because iOS was based on OS X and they could use their existing knowledge. A little later when the official iPhone SDK came out, those developers were the hottest in the world and got paid huge amounts to develop simple apps.
When Quark XPress decided not to support OS X back around 2001, Adobe InDesign took many of their customers. There are Mac apps that will never be updated (or will take five years like Adobe) for 64-bit or ARM and people will be looking for replacements.
The most likely opportunity is applications that are currently too sluggish except on big Mac Pros, but would be more popular if people could run them on cheap ARM macs. One might be real time video manipulation for live video conferencing.
You can get your feet wet by developing for iPad, or ARM Linux.
Most software should be just a recompile if it's well packaged. Of course that's a huge if and not everybody wants to support Mac anyway, and I lost a ton of my steam library (not that anybody really plays games on Mac anyway) in just the 32-64 bit transition recently. I also lost textwrangler, which was the greatest Mac text editor ever created and I refuse to pay a subscription for its 64 bit successor.
It isn't just Apple that will be selling ARM computers. Soon we will see good workstations based on server-type ARM chips that will support absolutely insane bandwidth and number of threads. For now we have
https://www.nvidia.com/en-us/autonomous-machines/embedded-sy...
The software ecosystem is ragged so there is work to be done. ARM has a bright future whether or not Apple switches macs over.