Ehhh I wouldn’t think it’d make a significant difference on its own. London is what it is (was what it was?) because of centuries of English imperial hegemony, not just because it’s English-speaking. Berliners speak the global lingua franca virtually just as well and - with no slight intended to the Irish - their city is a much more natural fit as the new European cosmopolitan cultural Mecca.

Dublin’s rising global prominence probably has more to do with Ireland’s rather business-friendly taxation policies.