Thanks to Chrome's universal address bar people are already getting used to not caring about the domain - with a clusterfuck of tlds which makes the right address basically impossible to guess, why would they bother trying?
And I honestly don't see that as a bad thing.
I rarely guess domain names. If I don't know the address, I search it. I expect most normal people search it even if they do know the address.
On the bright side, this might kill ICANN or at least make them irrelevant. That is a good thing because ICANN is arguably the worst possible gatekeeper for internet names. They combine the worst aspects of the private and public world: they inherited a monopoly over a public resource which frees them from the constraints of being an efficient and trustworthy business, like so many state bureaucracies; yet they are a private entity not accountable to the public in any way.
Search Engines aren't the end all be all.
I'm not even sure how you came to that conclusion based on what I said.
Multiple domain names (like book et al) will hopefully be easier to remember.
Things like "harrypotter.book" or "looking-for.love" won't be easy to forget if you see them once.
Domains shouldn't be a guessing game anyway.
This is a huge loss for UX on the Internet.