Foden will 100% be a England player in future. Maybe even as early as Euro 2020 if he plays enough for Man City.
Rashford you'd expect to be around obviously.
I hope Chilwell continues to develop well and make a name for himself to be in international reckoning.
Maguire is only mid 20s as well so think he'll be around for a while.
I hope Henderson isn't still there in 4 years time
Leon Bailey is only 20 years old so you'd hope he gets his chance before another nation goes for him.
There's also players like Jonjoe Kenny, Kyle Walker-Peters, Gomez, Holgate, Dowell, Tom Davies, Patrick Roberts, Josh Onomah, Calvert-Lewin, Tuanzebe who all could potentially be England regulars in future.
(fuck me there's a lot of Everton players there in that last paragraph! They've done well producing their youngsters recently)