Oh, and I too believe there is a solution.
Yet jumping at what appears to be the solution in the short term I think is likely to bite us in the ass.
If we can come up with a compelling reason someone would want to have power beyond the voting cap, where they still get liquid currency then I believe that could transform this into a more long term solution.
All I can think of for the future is for account verification processes to limit the number of accounts a person can control and/or have levels of what an account can do with/without verification. I well appreciate how difficult it is to implement a water-tight account verification process and also, we'd need to do something interesting to enable privacy to be possible.