I think, overall, there is something missing in youth coaching, we've had three generations of player turn in the same performance, we're doing something wrong
Agree with something in the coaching (Iceland btw invested very heavily in even low level coaches getting their badges), you can see the difference with Dier as compared to average young English defenders. However, people often look for a single, silver bullet answer, i.e. if we just do this, then we get that. My opinion is it is a little more complicated than that.
I look at England and go, here's your list ...
- Bad manager choices, if you can't win the PL, why would we expect you to lead the national team to success? (and there goes your English coach theory)
- Youth coaching still can be improved (I think it has in last 5-10 years, but still areas for improvement)
- Challenges with squad selection (team bias, picking bets player not best team, picking players on name not form, taking injured, recently injured, unfit players to major tournaments)
- All English players come from PL, creates lack of exposure to other styles, additionally the PL is a grindfest, by tournament time most players are burnt out
- The media has made playing for England unpleasant, hype -> hero -> villain in a month, I can see players wanting no real part of that (bet you Uruguay & Portugal press don't ride Suarez & Ronaldo like English media ride Rooney/Hart/etc.)
- No style/system, how is England supposed to play? is it 4-4-2, is quick/slow, tactical, short passing, long ball, what? can't get consistency without have an identity as team (Italy defense, Spain short passes, England uninventive)
Opinion on what order those should be in, but the FA should really look at that and go .. how do we solve 2/3/4 on that list?