What they need to do instead of getting rid of stuff is instead supporting it for a long time (10+ years) and just not putting any new features into it / letting new people sign up.
Otherwise, they'll continue to lose developers' trust.
What does this mean for users like me who use Google’s OpenID as the backend for OpenID delegation? Will I still be able to log in with “http://roryokane.com/” as my OpenID if I keep the delegation tags at that address pointed to Google’s servers, or will I have to switch to a different OpenID provider? This Google+ integration won’t work for me, since none of the OpenID sites I am signed into even know that I have a Google account; they just know my pre-delegation OpenID.
Ridiculously misleading title. Yes, OpenID 2.0 is being deprecated, yes they'd like you to move to Google+ Sign-In, but you can also move to OpenID Connect[0], which is a saner realization of OAuth 2.0 than OpenID 2.0 was.
And this is made clear right on the page linked to. There is no way anyone acting in good faith could draw the conclusion that you're being required to move to Google+ Sign-In.
It's a transparent attempt to cast Google in a negative light by pretending they're requiring use of some proprietary API instead of an open standard, and it's working beautifully (see top-level comment by seanp2k2 and thegenius's reply).
Yes, it looks like Google is moving on from OpenID 2.0 to OpenID Connect, which is the new standard [0]. It appears that OpenID 2.0 login will be kept for compatibility, though [1].
Google+ Sign-In is an implementation of OpenID Connect, with some nice features built on top:
"Google+ Sign-In is built on the OAuth 2.0 and OpenID Connect protocols. It supports over-the-air installs, social features, and a sign-in widget on top of standardized OpenID Connect sign-in flows. Google+ Sign-In works for all users with a Google account, whether or not they have upgraded to Google+." [2]
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[ 1.5 ms ] story [ 37.2 ms ] threadWhat they need to do instead of getting rid of stuff is instead supporting it for a long time (10+ years) and just not putting any new features into it / letting new people sign up.
Otherwise, they'll continue to lose developers' trust.
And this is made clear right on the page linked to. There is no way anyone acting in good faith could draw the conclusion that you're being required to move to Google+ Sign-In.
[0] http://openid.net/connect/
Your comment is misleading however, they're not asking you to pick one or the other -- since they're the same thing.
Google+ Sign-In is an implementation of OpenID Connect, with some nice features built on top:
"Google+ Sign-In is built on the OAuth 2.0 and OpenID Connect protocols. It supports over-the-air installs, social features, and a sign-in widget on top of standardized OpenID Connect sign-in flows. Google+ Sign-In works for all users with a Google account, whether or not they have upgraded to Google+." [2]
[0]: http://openid.net/connect/
[1]: https://developers.google.com/+/api/auth-migration
[2]: https://developers.google.com/accounts/docs/OAuth2Login