"Given that powerpc chips are still the market dominant server chip"
Thats a fundamental misreading of that wiki article
What it actually says is " For example, IBM's servers based on POWER have the highest revenue marketshare (53.9%) among UNIX servers"
Note - UNIX servers, which are a dying breed. Many more people use a Linux variant (which isn't Unix), while what about all the various flavours of Windows?
A majority share of a declining market, is still a declining share.