You should read Crickonomics, there's a really good chapter on how the fastest developing region in cricket is going to be Asia and the smaller nations there because they benefit so much from being based close to a cricket super power.
Would it be that unfair though if that talent has been developed through the English coaching system? I think there's a bit of nuance here you're missing. Scotland/Wales gain far more from having really close links to The Best League In The World.
Under FIFA rules as of 2017, the 2030 World Cup cannot be held in Asia (AFC) or in North America (CONCACAF), following the selection of Qatar for 2022, and Canada, Mexico and the United States for 2026.
As Rob said, if you're going to do it, you need to do it with someone who is established in the English game, and quite frankly how many of those are a) actually suited to international management and b) going to ditch the club game for internationals?
Should be said if we aren't producing coaches who are good enough then that is a really bad reflection on the FA and our system, but national teams are heavily influenced by non-nationals in all sorts of ways, so I'm deeply relaxed about what the nationality of the coach is.
Would be mad if we wasted the best years we might ever have as England fans because Lee Carsley has a British passport.