In answer to your points, I'm not saying it isn't a rare event. What happens if your keeper gets injured then? You may not be down to 10 men, but you are not giving your best shot at winning the game, with an outfielder in goal. Surely if you have 5, or 7 subs, you are best to have a goalie there.
In response to your second point. Wouldn't you expect your team to make the best of the situation? Sounds rather like giving up to me. Put a decent keeper on and at least give yourself a chance.
1) a goalkeeper being sent off is a pretty rare event 2) if it happens, the team are down to 10 men and are less likely to win anyway, especially as they'll be more than likely facing an opposition... more
but my disagreement with you is that Waddock's decision to go without a keeper last season was not a MISTAKE, since it was GAMBLE that never backfired. It was a calculated risk - not a mistake - and... more