[danudey]

You're making a false assumption here that those users will stop logging into Flickr when Facebook auth is removed; the more likely scenario is that the majority of those users will create a Yahoo ID and use that, rather than abandoning Flickr entirely.

[mmmooo]

I wasn't really stating that assumption, and I agree, many will convert, but I was simply referring to what they are 'betting with'. Yes that's the most they can lose (ignoring that people pissed off at this move may leave even if they didn't use fb/g+), but its still how much you put in the pot. At least for me.