Even though the travelling would be considerable, surely any ambition person would want to test themselves at as high level as possible? As can be seen from the 2 sides promoted from Conf North last year struggling at present in National, then there is quite a step up.
It is almost a no brainer to me that he would want to test himself for Dover than come back to us and if he makes a go of it there then it will either help him for Luton or secure a move to another Conf Nat team. The only way he will end up outside of those 2 divisions, and thus any possibility of returning here, would be if he doesn't make it (either for his own reasons or circumstances beyond his control).
I do think, however, that we will not be seeing him with us and good luck to him in his future career (unless playing against us)