I am quite sure that they will be refunding everything as far as they can - meaning, if you just withdraw your funds, you'll be fine. If they end up preventing US citizens from loging in, your best shot will be to make use of a VPN, or have a trusted (non US) forum escrow take out the funds for you. Them not offering services anymore to US citizens definitely doesn't mean you can kiss your funds goodbye. Most of the people there never even verified themselves, so in the end, there is no way to prove where you come from since IP's can be 'faked' due to proxies and VPN's, etc. If they really end up coming back, you should be getting your funds out without much problems, or at least, what's left of your funds, more precisely said.