When it's all said and done and the raging flames of Punk fandom have turned to smouldering embers, the bare bones of his career will be visible. As an athlete he's better than Hulk Hogan but no way can he touch Hogans overwhelming popularity and longevity. As a wrestler he's better than John Cena but although Punk connects strongly with a group of fans, his appeal is not as universal. As a talker he's better than most but does he have the career versatility of the Big Show, who has had many phases/chapters to his career - The Giant/NWO/The Corporation/various successful tag teams and much more. Sure Punk has had his ECW run, SES, Nexus, Heyman but all that has been very little variation on the same theme. Essentially his character has not changed one little bit. Where's the growth? Comparatively, he's on a level right now of a Rey Mysterio - a stellar career but will continue to make few waves once he's gone. He's not leaving behind much, if anything, that other guys haven't done before him. That he has it all in one package? It's remarkable, but not that memorable. Other guys who had the same type of package as Punk - great talker, great performer, great heat generator - guys like Edge (who's already being devalued by fans) or Ted DiBiase.
He's already a deserving Hall Of Famer but the sad fact is, wrestling fans have a history of not being able to appreciate something that has gone as much as whats here right now. They're very much of the attitude of "What have you done for me lately?" and "If you're not offering me something now, why should I care?".