I was lucky enough to play in the anniversary rematch of this game (yeah, we lost again...).
http://news.bbc.co.uk/sport1/hi/football/fa_cup/8015389.stm
Looking at the list of available managers, I will be absolutely delighted if it's somebody I haven't even heard of. Because nobody that I have heard of, fills me with any kind of hope for a positive appointment.
You certainly can't argue that there was a defender and goalkeeper covering, but you also can't deny it was a 'clear goalscoring opportunity' therefore, a sending off is correct.