There is no going back from this point, if he goes back now with all the attention his concerts are getting everyone will be so dissapointed and nobody will take him seriously if he tries to do concerts again.
I dont see why he would cancel anyway, and people who say he will cancel them dont even really know what they are talking about and they feel he isnt healthy enough to do it.
But we know Michael, and he is a perfectionist. He would not agree to all these shows if he didnt feel he could do it! The man cried after Motown 25 for crying out loud, thats how much a perfectionist he is lol