Very interesting scenario.
Firstly i think CM Punk would have been able to defend himself. If he would have noticed something weird into Benoit's behavior and eyes, then i am sure that someway/somehow he would have informed the referee, or someone from the guys that stand next to the commentators and he would probably count himself out. Of course this would be a huge risk for him, only in case that he was wrong(it would be very disrespectfull towards Benoit, to accuse him for something like that), but usually you can sense the danger at some point. Now if Benoit would have applied a crippler crossface or any other wrestling maneuver and he would about to suffocate Punk, i think that the ref would have figure it out. Usually you can tell by someone's body language if everything's okay or not, the referees are very experienced(not in these kind of situations of course but in general.
bq1: So to answer this bq, like i said above, then yes. He would probably try to break the hold or whatever and he would immediately call for help. ALTHOUGH, i am sure that WWE has raised awareness about such kind of incidents AFTER what happend to Benoit...WHAT IF..this would of happend if nothing like that has ever happend? Would the WWE had raised awareness for such a scenario?!..cause i don't think anything like that has happend on professional wrestling and especially in a live pay per view broadcast.
bq2: Yeah. It would be much MUCH harder. I remember those days, the media in general went crazy on how dangerous it's the WWE, and pro wrestling in general. We have been witnessing so many accusations about steroids and brain damages due to concussions etc. WWE have been critisized very much the weeks surrounding the incident, so IF such thing would have happend live on tv, then it would be much more difficult for them to cover anything like that up. Think logically here, even if it is a thing that happens once in a lifetime, as a parent, would you let your children watch a show, knowing that a few weeks ago a wrestler killed another one on purpose, on live television only because he had brain damage etc? I don't think i would let my kids watch it after that. I am not sure.
bq3: Tough to choose, but yeah, i think they would. It seems like WWE always finds a way to erase people's memory, so they would have probably find a way to cover up the story. Like ive said, they would lose part of the audience, they would of being accused even more, but still they would have sell it as *it can happen to anyone* sort of story to cover it up. But also imagine, what if Benoit wouldn't have attacked Punk, and he would attack a kid from the crowd with his desperate parent would have been trying to save his kid?! That would be even more tragic imo.
Weird & unique question.