While the system worked in theory, in practice it meant that people were stockpiling event currency on alts, secure in the knowledge that next year they could just unlock the ship once without much effort and then get it on the cheap elsewhere. As a result, the currencies are being changed, but these event prestige ships are being shifted to account-wide unlocks to keep alts in the loop. It’s not an ideal solution for those with lots of currency saved up, but it keeps the ships you’ve earned and also makes sure that people are still taking part in the content.
Source: Forum posting