If we consider 'by numbers' to be the most important metric, I suspect the 8051 is still the world champ ISA. But I'm going to set 'by numbers' in this context over here next to 30+ years of "x86 is definitely, without a doubt, no question dead in the water Real Soon Now".
P.S. - I thought RISC-V was killing x86 these days. ARM killed it last time. Itanium the time before that. And the RISC hoard before that.
