Funny, I've been thinking the same thing lately. And I've been dependent on Google and Android for a while now.
Why. Google plus was the last subtle thing to set it off.
I've used Google Apps for all of my email on my domain since it came out. Works great. I've had my domain for 15 years, and it's me. I depend on Android and my Google interconnects. I use Chrome on all my boxes. Everything works well.
Plus doesn't like Google Apps for your Domain. You've got to create a new gmail account for that. Something that's not me. Something that nobody knows me as. And Chrome/Google account switching will force that to be the default account.
Multiple account switching has also changed around, and it makes this gmail account your primary account, and I've got to keep using my password to get to my regular Google Apps email in Chrome. Now, the email I've depended on for 10 years multiple times a day requires me to keep switching back to my (now) non-default domain account, if I check Google plus also.
It sound petty, but it's made me stand back and say, "Wow, I'm _really_ dependent on Google, and this can get ugly". Being an open-source kind-of-guy, that makes me nervous.