Ohanian feels the future is rosy because he imagines that internet activism will continue to be dominated by "our" kind. A few million people at best.
We are absolutely, utterly outnumbered by people unlike "us".
As the tools get better, the difficulty of mounting such campaigns will fall to the point where there will be massive campaigns to have Congress save soap operas, ban Brad and Angelina from divorcing and protecting us from mobile phone towers (the chosen-not-to-interact-with-water radiationz zomg!).