As far as I know Mick is alive and fairly well, living on the Isle of Arran with his wife. The last few times I saw him were at the 1992, 1993, 1994 Glasgow Folk Festivals. It is said that outside the Festival his wife keeps him on Arran and out of harm's (i.e. the bottle's) way.
However, he not only has a voice like Ronnie Drew, he's also one of the greatest raconteurs alive. I remember him one night in the Victorian Bar of the Tron Theatre which was the main festival venue, telling a story that must have rambled on for an hour. I can't remember what it was about, but the sheer stamina was impressive. People were riveted - not everybody, perhaps, but certainly those who weren't used to him.
On the other hand, the shout 'Broderick's abroad!' could lead to hurried relocations and hiding of available bodhrans (no good, he always brings his own ...). He's a real character! - Susanne