It would be look your DC playing for another school team if they moved school pinkcrystal. Or like you getting a job somewhere other than the immediate area you were born in.
Re foreign players making the national teams less successful by hampering home grown talent, that's been said a couple of times on this thread but honestly, England's problem in the last couple of decades has not been a lack of sufficiently talented individuals (Scotland and in particular Wales and NI are a very different picture to England in respect of both club and country football). It's been the failure of those very talented individuals to gel, and in some instances poor management and decision making, eg Sven's striker selection for the 2006 world cup. Which is something quite different.
That's not to say more talent isn't always nice, and it's certainly possible to identify certain English teams with a weakness in certain positions. But if you compare for example the 2016 world cup team with the 1998 world cup team, or 2002, the earlier teams are so much better as a collection of individuals than 2018. Yet they did nowhere near as well.
Or google Lampard and Gerrard. Two of the best midfielders on the planet at the time of the 2010 world cup, but they never played well together. There's been reams written on it. It wasn't because they weren't talented enough either, and they both played brilliantly and won loads for their clubs. They just didn't gel.
This argument also ignores that the very best English players have been mostly playing in the Premiership alongside some of the best global talent, less so now than perhaps a decade ago admittedly, and this has honed their talent too. Ie the argument that Wayne Rooney learned more from playing alongside Ronaldo than he would've done from the not as good homegrown player who'd have got the gig if Ronaldo's nationality ruled him out. That it makes the best better, and those are the ones who make national teams.
There are obviously UK players who would be playing in the Premiership if the competition was less but aren't able to compete with the best foreign talent at the moment. But if you can't get onto a Premiership team because of foreign players, why if they all left would you then be good enough to get into a world cup squad comprising only 25? It's really not as simple as it's being made out to be.