Not many rival fans will accept it (and fair enough too), but Guardiola has done English football a huge favour - and Gareth Southgate, who is nobody's fool - was quick to say so too. It's demonstrated that this kind of football not only works in this country, but has the capacity to render the more traditional managers as being out of their depth, and unable to cope with it. Klopp too, to an extent has reinforced the point. Oddly enough, Roy Hodgson is inclined that way too, but felt unable to enforce that on England, while Wenger was very much out on his own at the time he was at his best.
So I'd argue that it's principally Guardiola, but definitely Southgate and Klopp as well who have changed a lot of perceptions. Southgate doing it with England also had the unifying effect that fans of all clubs quite liked the approach, while accepting it was very much a work in progress. But what it did was suggest a way that England could win a World Cup in future, and that's an enormous change in mentality. While Guardiola's philosophy has demolished everyone else, bar Liverpool who are now cut from not totally dissimilar cloth.
Yes. I'd say we've already reached that tipping point. And the English youth players who were able to go out and win European and World titles have also been a part of that. And the guy who put them on that path as the director of England youth development a decade ago? Gareth Southgate.
It's been a virtuous circle and it's going to make a huge difference.