When will it get to some people's head that Rock is going to be full time until WM (or around that period)? He will be a full timer until he drops the belt. To whom? I do not know, but the title reign reign won't definitely be long.
How will this set up be beneficial to the WWE? Huge money, better ratings, 5 times the exposure than the one they have had in the last 14 months on average. WWE will be mainstream again, at least for the next 2 months guaranteed. And someone is going to get a big rub off The Great One's massively exposed title reign, compared to the Sunday Night Heat treatment the WWE championship had gotten in the past year, on the grandaddy of em all, who will also carry the company through the end of the year with the massive super saiyan esque character development he will received in front of 1.5 million television sets.
1.Rock isn't going to be a full time wrestler.Rock is a part-time wrestler.He is one of the busiest actors in Hollywood.
2.Rock's mere presence will bring WWE money.Not necessary he should win the title.
3.WWE wasn't mainstream when Rock vs Cena happened.It certainly won't happen now since Punk is not even on the same level as Cena.
4.When CM Punk retains the title against Rock,the prestige of the title will be more.
5.Rock winning the title will show how shitty the roster.He had his win against Cena.He is one of the GOATS.Doesn't mean he has to beat everyone in the current roster.
If Mike Tyson came back and beat the World Champion;
The short term benefit is people will take notice.
The long time problem is people will talk about what a shitty heavyweight divison it is.