I don't think that his record is unbreakable, remember LoyceV on fell short of only 4 days which is really near and LoyceV is also very active in the forum currently and to top it off he is also a merit source which means that there is a high chance that the one he has sent the merits to has a certain influence on returning back the favor. I don't know when but I am sure that nullius' record is nowhere untouchable and someone will break it someday.
Generally, requires a very high quality member for that to happen though, and there aren't too many that are near that standard. Plus, it also depends on how much sMerit users have to distribute at the time. You could get lucky, and a lot of merit sources recently got their sMerit back or you could be completely unlucky, and they have already ran out. There's a little bit of luck required too.