Re: The delay won't be from Google
"I think people will simply switch to Chromium forks where it still works."
A minuscule proportion of all Chrome users will switch. They're the technical people like the El Reg forum dwellers.
Think about your next door neigbours, your CEO or your parents/children. Most people are just using "a browser". Just like the blue E letter used to mean Internet access some years ago, now it's that multicoloured ball icon that is the internet for most people in the world.
Of all Chrome users (billions of them?), a minority know about, or use adblockers or other plugins that will stop working. Those in the know will move to Firefox or whatever Chromium fork will survive but masses won't.