http://online.wsj.com/article/SB10001424052748703280004575308953569367286.html I chose to fund a conventional Roth. I'll take my tax break now thank you very much.
Eventually we'll be able to enjoy some sort of wealth tax in the People's States of America. Wouldn't be surprised to see it cover Roths.
if there ever is a significant amount of money holed up anywhere, you can trust the government will not hesitate to tax it when given the opportunity- i think it is quite unlikely that roth ira's will escape the tax for the 40 years or so i'd have to wait.