100m? lol impossible, this mean a total hash rate of 1 peta, not gonna happen, in the worse case scenario, the difficulty will reach 50m at the end of summer
100M difficulty is "only" 720TH/s. I might be off by a month or two, but we'll get there fast with Bitfury, BFL, Avalon chips shipping and asicminer expanding.
So wrong.. it won't come that soon.