I remember years back when AMD became competitive with intel and then intel turned around and came out with fast cpus, and we had all kinds of choices.
I think the PC is a really good thing we don't want to lose it. When we have competition it is better for customers with more choices, and employees who actually have to compete, and there are standard interfaces new companies can develop for.
Honestly, what I worry about is Apple and their spiral into themselves and their closed ecosystem.
I think Apple was at their best when the adopted the PC architecture and interoperability made everything better.