I've always said that this season is his test for me. He inherited a defensively solid unit from Moyes and added some immediate attacking nous. Job done and it worked quite well.
I was prepared to write off last season as his learning one (imo you're allowed one, but you need to learn from it!).
This season is the test for me. Did he learn from his lack of focus (last season) in defence.
The answer is clear to me right now.
He has made us more exciting to watch and we do for lots of the game play some nice stuff, but without working on defending, we will always ship goals.
I'd say he's cooked his goose in this game, but I wouldn't be hasty in any appointment, I'd make certain we took our time and made the right one. No need to upset the apple cart at this point in a season, however the search should start now.