[naming_the_user]

It depends what you mean by extinct.

I can't think of any actual computer outside of embedded that has been single core for at least a decade. The Core Duo and Athlon X2 were released almost 20 years ago now and within a few years basically everything was multicore.

(When did we get old?)

If you mean that single core workloads will be extinct, well, that's a harder sell.

[simonw]

Yeah, I just checked and even a RaspberryPi has four cores these days. So I guess they went extinct a long time ago!

[poincaredisk]

Yes, but:

* Most of the programs I write are not (trivially) parallelizable, and a the bottleneck is still a single core performance

* There is more than one process at any time, especially on servers. Other cores are also busy and have their own work to do.

[deadbunny]

Yes, but:

1. Other people with different needs exist.

2. That's why we have schedulers.

[formerly_proven]

Even many microcontrollers have multiple cores nowadays. It’s not the norm just yet, though.