It already is. My company runs hundreds (possibly thousands) of ARM64-based instances right now. It’s done great things for our cloud spend. We still have more x86 stuff than ARM because some applications just don’t perform as well on ARM, but I can imagine that ratio will change as software gets more optimized (specifically the JDK, golang’s compiler, and GCC/LLVM) and Ampere releases new systems with better single thread perf.

EDIT: Ampere, not Alterra. God damn tech company names.