Yeah, sure, go work in any corporate environment that have to work with outsiders, or even just a slightly large structure, and just tell people “take time to readjust, and you’ll find replacements”.
I’m in a very small structure, and even getting people to ditch Outlook in favor of Thunderbird is impossible because “they can’t work with it”. I know what they do with Outlook, I know they can do it with Thunderbird, but that does not make people magically accept change. We setup a whole ecosystem of tools, self-hosted, that performs adequately and can handle everything we do. This did not stop management from getting more Teams license.
Wishful thinking is nice as long as you live in a vacuum or are omnipotent. Back in the real, non frictionless world, this takes time, careful preparation, and the slightest bump will throw all efforts out the window.