If the TrueCrypt devs are done with the project, is there anything legally preventing others from restarting development on it? I know the software had an oddba

If the TrueCrypt devs are done with the project, is there anything legally preventing others from restarting development on it? I know the software had an oddball license that wasn't always well-received. My point here being, with the source being available, why do we need to assume that TrueCrypt is history, other than perhaps a lack of people willing to work on it (which I assume could change now that there is an immediate need for some)?