Good insight. While it IS possible to syndicate comments on G+ elsewhere, it's not a natural part of the experience from a UI standpoint. Perhaps as a result, we come to think of G+ as more of a long-form medium. I agree with your point that like Quora or something, you come to G+ to "talk to yourself".
Personally, I can only hope that the G+ team spends some quality time really thinking about what the personality characteristics are of G+ and what they can do to enhance what's good about it. It's too big now to change its personality to make it more like FB.
FB & G+ suffer the industry-wide envy of the ultra-passive streams created by Pinterest, Instagram, Tumblr and a swath of imitators. Perhaps the answer is to channel the effort into a new tab form. Break out today's long-form "G+ shares" from Home and add a new stream of shares from third party apps.
If Google got out there and promoted G+ as a means to provide distribution to third-party mobile photo apps, there are many very creative new players out there without the distribution means that would jump all over it.
There are a lot of people out there looking for the next thing after Instagram. Filters are so last Tuesday. http://dipticapp.com/
are just a few (BTW: that link thing in G+ is annoying). By creating a distribution means they'll be playing to their strength while creating an interest magnet for G+. Separating out these kinds of "long-form" shares, they'll have a shot at keeping the social circles straight. The home becomes like a unified email box.
Oh, and +Anton Wahlman
, I'm going to guess that "the next 20 people" you met on the street were men and you were walking down Wall Street or something. If you had asked average people on Main Street (or even Seventh Avenue) you might have had a very different response.