I believe google is more than enough to satisfy everyone's quest out there. No need to launch an unknown q&a platform. From my impression, this will be dead soon. Anyway, the team can always contradict such prediction.
Certainly Google is very useful as a platform to ask questions.
However, if you want to know the problems and experiences of human relationships, Google is not suitable.
More than anything, it proves that there are people using Q & A sites such as Yahoo! Answer.
Therefore, I am confident that Q & A using block chains will be used by many people.