Of course he is, he changed the way the best Spanish NT in history played, he has also indirectly affected the way the German NT plays. He's created a brand of football, that is very much associated with him, and his idea of playing with a false #9 while not easily applied, is revolutionary. He is also the best coach in Barcelona's history.
I believe he's a revolutionary manager; his ideas have had an impact on every country he coaches in. I'm pretty sure by the time he retires he'll go down as one of the best in history. Instead of hating, you guys should be grateful you were around in his era.
Looking purely at the 'revolutionary' bit, as I'm not really interested in getting into a debate about how good a coach Guardiola is:
I don't think he's done anything significant enough to be considered revolutionary.
He's altered things a little, but everything he has done, that I can think of, is merely another step along from what someone else was already doing.
He's evolutionary in my book.
He's tinkered with Total Football, but that hd already been evolving for almost 40 years.
He's used a 'false nine', but that concept had been around for quite a while even if no-one had bothered to put a label on it, but that goes back in some form at least as far as Puskas's Hungary team and we've seen Totti in that role more recently.
The biggest thing I can think of Guardiola doing to change football is the really extreme emphasis on keeping possession. I can't think of anyone else who has come close to trying to have as much possession as Guardiola teams do.
And I believe that to be a development that is not good for football.
Anyway, no-one has played like Guardiola, as no-one had put those pre-existing concepts together in the way he has, but I don't think he's actually come up with anything of sufficient originality to be considered 'revolutionary'.
Then again, I think almost nothing in football (or the world in general) is revolutionary - it's almost invariably a case of just developing someone else's idea a little further or adjusting it to suit yourself.