I don't know what the answer is to be honest . We had similar debates / discussions when Lillee and Thomson were blowing us away.I read an article yesterday about young up and coming quicks in England. There are quite a few , one or two clocked at 93/94 mph, but I think we need a conveyor belt like they seem to have in Australia , to have any hope that a few might make it to Test level.
Tymal Mills is a good example. The only really genuine quick bowler I've seen in English cricket in the last 10 years , but his body is wrecked.
Mental toughness is probably more important in cricket than most other sports . It's a character building sport. Does our liberal , everyone wins a prize no one loses education system, prepare our young sportsman to front up to the mouthy , full of confidence , in your face Aussies ?