Great argument, how people may or may not use a browser in the future :) What if instead we look at current reality, which is what I outlined in my previous comment?
Which will end the day Apple is forced to allow Chrome on iOS.
In the anglosphere and averaged out globally, yes, this is true. But country-per-country, the stats vary wildly. Some countries have ~20% Safari usage, others have ~20% Firefox usage. Other countries like Germany for example has Chrome usage below 50%, which is pretty neat.
But yeah, if you're a Usaian, I could understand if "the world" looks differently.
Only best effort, not a requirement.