O come on mate that's daft, we could have Southall in goal at his peak right now, if we just allow chance after chance after chance it isn't going to work, there is no such thing as last line of defence in football, a team has to defend as a full unit, right from the front throughout the starting 11, it's not a one man job.
As Timak said, replacing Howard wont solve the problem, yes it might help, and it has to be done tomorrow really, yes it might get us a few more points a season, but it wont see us make any significant strides up the table.