Basically if you take average 1v1 game, if picks don´t overlay you end up watching 1-4 turns empty, because there is no contact.
This is valid criticism.  There might not be much information given in the first few turns.  Arguably most interesting parts of the game--territories captured, large stack attacks-- will be visible to spectators.  However, it's a valid question whether this will be enough to draw in spectators.
Now take FFA game. 
No, please do not.  I agree this idea doesn't work for ffa.