You have to ask an attorney to veify this, but I've always been told that you can ONLY sue for actual financial damages that you have incurred as a result of them breaching the contract. So if you've had to stay in a hotel for three months because of this, you could figure out the costs of that that are above and beyond what you would have been paying for your mortgage and sue for that amount. It doesn't add up to much so most people usually don't waste there time and money in a costly law suite. Your best option if this tuns out to be the case would be to get your earnest money back and move on to another home. Unless you're that attached to this home that it's worth it to you to wait it out. I'm sorry for your hardship in this matter and do hope that you are able to get it resolved.
RE/MAX All Properties
Although you in an unfortunate situation the buyers have no control over what the bank is doing, as it happens in cases like this. A lawsuit against the buyers may not give you any satisfaction either. I certainly would talk with your attorney about it, but doubt that he/she would advise you to do anything but be patient for matters to get worked out or find another home. Just my two cents.
Century 21 Pro-Team