This is the irony. Undoubtedly, Wenger (and his promises?) were the reason why both players joined us. His leaving will make it more likely that both players will leave - as its difficult to see what 'name' would convince them that Wenger going wouldn't simply mean another protracted rebuilding period. Guardiola would have done but the fact is that there are few managers of his stature/track record around. Would Conte have the same effect, for example?
I think it's become clear why the addition of 3 genuinely world class players joining us has not pushed us on - and that's because Wenger trusted his existing players to improve to be able to play the way he visualises the game, but instead they are either simply not good enough or have failed to improve...