Realistically speaking, what'll happen if the one juror refuses to back down, could he be forced? Would the case go on indefinitely or will it be dropped?
If he has good reason to obstruct, I think he can actually hold indefinitely but the defense will attempt to force the judge to then force the juror or force the judge to make a ruling based on the remaining juror's discretion. Of course, prosecution will challenge this and the whole thing could get stuck for a long time. If its a defense against the defense, obviously.
Right now, at least from the reports I've read, the judge is not letting the jury off the hook with any sort of forced resolution. Eventually I believe it becomes a mistrial, though, and they have to select new jurors.