Double relegation happened to none of them....Wigan made the play offs first season they were down as did Leeds. Both went down the following season. Blackpool also made the play off final the first season aswell. Only team to have a double relegation is Wolves amusingly who were actually in good financial state when they came down but made some idiotic managerial appointments and kept faith with a losing squad....no chance of that happening here...oh!!!
More I look at it more we need to come up straight away otherwise I'd worry...other teams like Boro (o.k looking good this season), Fulham, Blackburn, Bolton were in prem for years and years, went down, couldn't come straight up and then the whole club stagnates, squad starts to get worse and crowds drop and now those teams look more likely to get relegated than get promoted.