There are two questions this brings up to me, in relation to your points. 1) At one point are people willing to give up on Facebook w/o an alternative in enoug

There are two questions this brings up to me, in relation to your points. 1) At one point are people willing to give up on Facebook w/o an alternative in enough numbers to seriously hurt the site. 2) How big is the time window that FB has to fix the problems before a competitor automatically could become a serious threat simply because of how fed up people are?