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This paper highlights the only real concern I have with BitCoin over the long term: that it's possible to engage in class warfare.

If you believe the socioeconomic pyramid to hold true, the middle and lower classes will always outnumber the top 1%. And by achieving this power of economic majority, they can gang up on the "elites" by means described in this paper. I'm not going to get into the messy debate of whether it's justifiable; just that the capability exists. Maybe this paper won't do it. Maybe one that comes out in 30 years will, under the correct economic and political climate, finally incite people to make this happen.

Or you could argue that the top 1% would have been prepared by using some of their wealth to gain control of the means of production (mining machines) and secure an economic majority. What's to guarantee they won't rig up some positively reinforcing rules to ensure their prosperity at the expense of the general public?

Currencies run on immutable rules. BitCoin has had a good run so far, but its kill switch is already in the collective hands of three people: the leaders of ASICMiners, Slush, and BTC Guild.