I'm actually cautiously optimistic about him as a manager. I imagine he'll be given a reasonable amount of time as Fleetwood will have mid table ambitions so may not be given over a season.
Sent to the stands? Within minutes if he's lucky.
Long term I don't see him being a future England manager or anything. I can see a strong football league manager career, similar to Paul Ince. I reckon he'll grow up very quickly as a manager when he sees everything he has to deal with.