It's important to try and de-googleify your life if only so you don't get caught up in making such an exaggerated sky-is-falling point. All of these could literally vanish tomorrow and the world would go on, they all have their alternatives, some of them arguably superior. For some, the near term pain would be greater than for others -- even just on my personal level I'd be caught with my pants down for email, because while I have over the years moved a lot of email addresses to something at my own domain name, I haven't done it for all of them, and I'd still need to update the forwarding to not-google. Not a huge deal though. A big one you didn't even list that's more important than several you did combined is Youtube, but again there are alternatives.

The world would change, but I think quite a bit less than you seem to think. To put it another way, the world was undeniably changed by Google, but the change has been done, and they're no longer necessary to keep the biggest changes from reverting. (I'd be more worried about SBCL development if google flights' backend couldn't find a new home -- the product itself has tons of competition + just going directly to airlines.)

In actual reality, of course, these things don't disappear overnight, making the pain of switching much, much less for businesses and individuals heavily dependent on some of these things. Even if "google collapsing within a few years" was likely (they have something like a third or more of annual operating expenses saved as cash on hand), a few years is more than enough time. If a business can migrate off of Salesforce or SAP (it can be expensive and time consuming but you can do it!), it can migrate off these.