Exactly what happened with mine, so I got some jb weld, put it on the threads and wound it in, then a bit on top for luck.... Drove it to Paris and back and it's been fine and this was about a year ago!!
If the sump has to come off anyway to be re-tapped ( as you don't want to be getting swarf in there) then it may as well be replaced with a new one.... Just haven't got round to doing it yet!!!!
Oil pick up at the same time too
