walkman - 9:16 pm on Sep 19, 2011 (gmt 0)
I hope it isn't but G+ has put a lot into this, admitting defeat will cost them and might cause people to look at them as failures in all but search, one trick pony, copycats etc. This is their long term project and other steps have been planned.
Everything is coordinated among other properties usually, not much is coincidence. For example Android users apparently search twice as much as users on other phones. What a coincidence!