Sadly, currently this all is highly theoretical. The first thing we should focus on is getting 2FA (TOTP/HOTP or U2F) authenticated login on every service that doesn’t use OIDC. Even this very site, HN, has no such functionality (@dang, @pg: Why?)
This is a much more important first step, and once that’s fixed, we can look at improving credential rotation, and providing global SSO with browser credentials.