Like the Wintel (Windows/Intel) monoculture, ARM brings the GoogleArm monoculture. The Apple/Arm monoculture that some people seem to hope for would be no different: heavily restricted, with fewer possibilities for free software.
MIPS64 offer us a good royaltie-free alternative, to be independent of the western companies (UK/US based)
If Nvidia gets ARM, I fully expect the same shenanigans Intel pulled on X86.
So I hope a third party alternative (MIPS, Sparc, anything) will be there, hopefully with a major fab like Samsung behind it.