I got an idea... I'm not saying it's a good one, but it's an idea nonetheless.
.87, wipe all the accounts, BUT, leave official factions with around around a billion or two on a bank character owned by the faction. Then, factions like police and military can afford to outfit some defensive ships, and also place bounties, etc, which will enable people to make money in a way besides trading.
Would help maintain some balance.
OR, you wipe all the credits off all the characters and POB's, but leave the ships alone. That way, people can go and sell some of their ships to an NPC ship dealer to recover some money. That way, the people who are rich now, will still be more wealthy then, and potentially allow for the balance mentioned by Cris to be kept. Not quite as socialist as a complete wipe across the board.