Earlier quoted context omitted.
AOL is dead, long live AOL!/s For serious though, there's not really any lock-in here (yet). You could replace everything from the certificate through the public DNS with GoDaddy and things would work just fine. I don't really see Google moving to close the web parts of this.
We still need to make choices that guarantee it's the case in the future. We need to ensure we don't end up with environment as diverse as email where most people use Gmail, or Linux services which are all being rewritten under systemd, or many other cases where we voluntarily choose a monoculture that can force our choices in the future...
Good luck making something that's both 1) the most convenient and 2) not centralized.