G+ can't be google reader for two reasons: 1. Information density. Magazine style / tiles / graphics etc aren't the same as single line expandable headline with maybe 40 headlines visible per screen height. 2. Just the content. Reader didn't try to guess what you wanted to read or notify you what your friends were up to.
2. And yet there were non-trivial complaints Google Reader lost its original sharing/social functionality. So clearly not everyone prefers the social-less implementation. And fewer still would seem completely off-put by a social panel they can tune out and ignore (as they already were ignoring it on Google Reader's rise).