Not that I wouldn't want Apple to pay ARM more, but,

a) Apple is getting really good at switching CPU architectures when needed.

b) Don't they already have a forever licence to the ARM ISA (since the 90s/Newton) as well as a substantial in-house design team? I guess the renegotiations are about future/roadmapped ARM archictural enhancements.

It would be sad if there was a substantial fork of the arm64 ISA.