IPC is only high because there is so much to improve when your architecture is new.
unless AMD is right now working on a brand new architecture to replace ryzen in 2 years you can bet that in 2 years the IPC increases will sub 5% by then
As die nm node is reaching limits, 5nm is a likely end even if 3nm is on trial.
so normally a die shrink allows to double the transistors.
AMD went with IF to unload some stuff on a different chiplet allowing a scaling and yield to be superb.
So its still an innovated approach to scale, ipc not just with clockspeed.
Next year we see am5, on ryzen 4 with a likely redesign to some extent of the ryzen 3 coming out soonish.
AMD has shown the way they designed ryzen it been able to scale 15% ipc in each generation due to they cant milk the customer like Intel did for a decade.
Intel also burned their goodwill and brand alongside the 10nm epic fiasco.
New solutions and innovations usually happens when things starts to become limited the old way