There's a big difference when fans chant for Daniel Bryan during a match he has no connection to when fans are just expressing there opinion that they would rather be seeing him then what's going on Ine the ring.
So the people who chant for Punk are not saying that they would rather see him? It's the exact same thing going on. People are saying that they want him to come back, that WWE should do whatever they can to bring him back, and they are letting Punk know that they want him to settle whatever his differences are and return. That's the way I see it.
He walked out, so what? He's not the first, and you can bet he won't be the last guy to walk out on their job, be it for WWE or a regular 9 to 5 job. The man was burned out and upset with the way things were going, so he left. You can't fault him for leaving a situation that had he stayed could have turned out much worse. He will come back, maybe not in the near future, but he will return at some point. And that point may be this Monday, or the Chicago show. You just never know. But all this hate for a guy that in my opinion, did exactly what he always said he would, is ridiculous.
On the chants again, people can chant what they want. Whether it's Daniel Bryan, Yes!, What!, ECW, JBL, Cena Sucks, or CM Punk, it's their right to chant it. Just like it's your right to chant whatever it is you want to chant when you are in the crowd. Punk fans, myself included, want him to come back. And until that happens, or until he or WWE says it's not happening, the chants will continue. They will get smaller as time goes by, but they will be there.