A lot of people have iPads. They have replaced PCs for many tasks. Many I know only use their PCs for word processing or work. Other things we do on a computer are in the browser.
In 2 years I'll be replacing 2 Windows computers in my family. Give me the choice of a Mac with familiar iOS interface, and access to the App Store, or a Windows PC, only good for word processing and browsing the web, I choose Mac/iOS. I am familiar with iOS but not so much with Mac (I've owned 2 but could never get used to the UI). I reckon millions will be faced with the same choices.
I predict that in 5 years Dell, HP and Lenovo will be struggling. Time will tell...
Oh, and of course the M1 today ain't compelling enough. But wait until it evolves. Apple has a track record of iterating year over year. Fascinating...