It obvious war against China Intel And AppleBut not many. The guess of about 1 edition of MacOS has historical precedences. Apple dropped PowerPC support one edition after stopping to sell the G5 Power Mac.
In October 2005 Apple introduced the last revision of the G5 Power Mac
In August 2006 the Power Mac was replaced by the Mac Pro
The last version of OS-X to run on PowerPC chips was the 2007 Leopard (version 10.5).
2009's Snow Leopard did not run on PowerPC. That would be about 3 years, but the release cycles were longer back then.
With yearly releases I suspect, that support for Intel is dropped two years after the last Intel model has been replaced ... maybe even sooner.
I hope I am wrong, because I would love to bring my Mac Pro to 2030 and 20 years of great service...
its biggest mistake is that Apple relied on chineese manufactures who screw them up at the end and they destroyed Us economy Steve Jobs made biggest mistake in his life he sacrifice build quality in labour costs,
Now the problem will be Google because they will try to become Apple also sell you less hardware and offer you more money from ther services and they are better in that way
truth is they need customers not moviemakers or artist or competitors crazy world we are living