If that is true...and I am not at all doubting that you are correct...then I suspect that Zerocoin is dead out of the box because governments WILL certainly make illegal dealing in cryptocurrencies which can be easily used to facilitate illegal activities (which means they will never have a chance of mass adoption).
Oh right, just like the government snuffed out marijuana....
[Still, you have pointed out a real risk. There's no guarantee that Zerocoin will become bootleg-cool.]