Two brief comments:
One, of course nobody can predict the future, but there is a lot of irony in that scenario, to say the least. Working for City, the man faces war from day 1, the only thing we miss is the blood. We will witness that too, with players ending in hospital, if situations like the Brighton match continue. Which wasn't a one off, by the way. City face extreme "physicality" from opponents (a rather convenient way to put it instead of calling it what it is, dirty playing and cheating -which the media in this country will never do, they have their reasons) consistently all these years with zero protection from refs, never mind the calls we don't get while rivals do for ridiculous reasons. Guardiola knows exactly what's going on, if there were any doubts in his mind, I think the Chelsea match at home in his first season opened his eyes for good, it must have been a shock for him. The way he handles the situation reflects on his character (Pep will never seek excuses and transmits that same mentality to the team -which has played a major role in City's success), it also reflects on the club's policy -and I prefer to leave it here...
What I'm trying to say is that the football establishment and authorities in this country have been sending him clear messages since his arrival. "Everything we did, we did it ourselves", he has said, I don't think he has felt welcomed here. With such a history, offering him the England job would be some development. Not sure how he would feel about that option, even though he does appreciate the tradition of the sport in England and enjoys life in Manchester...
And two, if such a debate existed it no longer does, after City's achievements this season. A team with practically zero summer rest and zero preseason competing successfully in 4 fronts, playing every 3-4 days for the whole season. In one of the most, if not the most competitive and complicated league of the world. Unfortunately, most of the fans won't realise, therefore will not fully appreciate what City have done this season, it's a pity really. Guardiola has even beaten nature -temporarily perhaps, but he has. All over Europe, coleagues of his have tried to apply some of his methods, but failed miserably, the results are there for everyone to witness. The reason? There are specific requiremets and prerequisites for those methods, extremely demanding and complicated. Guardiola had the talent and a broad set of skills to fulfil them, others simply could not...
As I said, the average fan is just spending his time watching football, does not bother using his brain so as to assess the reality in front of his eyes, therefore the brilliance of managers like him is bound to remain unnoticed. If I only had the ability to describe how badly he will be missed after he leaves...