Unfortunately we live in a world of the quick fix, must have it now. Everywhere is run by a bloke who's only going to do the job for 3 to 5 years and he's only going to plan for short term. There is no vision or will to build success for someone else to gain the rewards.
3-5 years is an eternity in modern sport, it should be more than enough time
- The only thing that takes longer than that is investment/strategy implementation at youth/grassroots level of game, which arguably shouldn't be the main task of the manager anyway (simply something they have input on)
- It shouldn't take more than 6 months to decide and communicate clearly a system/style you expect England to play consistently, implementation make take an additional 6 months
- It shouldn't take more than 6 months to come up with a core 16-20 players, with additional time/games focused on getting first 11.
- It shouldn't take more than 6 months to set a selection policy (and communicate it) that players will be picked on form (with appropriate level of experience), based on best team fit, and players that are/have been recently injured will not be selected (do this one thing and you probably improve England immediately)
- It shouldn't take more than 6 months to change the pace/tempo of the game England plays (#2 problem for me behind selection issues)
Klinsmann has had the US team for 5 years, with control at all levels and he has made the team worse, still doesn't know his best 11 (after 5 fudging years), and has consistently made bizarre selection decisions (not taking Donovan & Dempsey to tournaments), Martinez would still be a brick manager for Everton if he had stayed another 5 years, as would Hodgson if you gave him another 10 tournaments with England.
Managerial consistency being tied to success is a myth in the modern game, club and countries should be able to support a change every 3-5 years.