stay PG? they only left strictly PG entertainment for the 4 years of the height of attitude era and even then it was TV14, the other 70yrs they've been family entertainment, PG based.
getting rid of all the edge, violence, blood is purely stockholders, network and sponsor deals requests to make the show totally family friendly and all this happened when they went publicly traded in October of 1999 after WCW went belly up the show was rapidly toned down. and within 2years we had the Ruthless Agression era, which was a toned down version of Attitude. Benoit didn't happen til 2007 years after they went publicly traded and 1 year after they implemented the Wellness Protection Policy as a result of Eddie Guerrero's death, Super Cena (kiddie fiddler) was the main man at the time of CB's incident, obviously the aftermath of that was they had to be really carefull and thus they went restricted even further the use of chair shots, head shots, blood to a minimum. CB's may have had something to do with how far PG they have taken it but it certainly wasn't the reason they stopped the attitude era.
the other thing to consider, WWF pre the attitude era was very family friendly, Hogan was very kiddy friendly too and did all the Charity stuff Cena does, well what was available at the time but he appealed to 90% of the crowd not 50/50 like Cena. The Attitude era just took everything far too much the other way and they had nowhere to go, they couldn't keep pushing the bar higher, stars were killing themselves to go higher and higher. Hence a change back to a simpler time gives everyone a chance to long for something again, rather then, meh we see people getting hit with chairs every match and bleeding over and over, it's overdone. and they can move forward which they have done in small steps.
so if you look at the ebb and flow we've done the Hogan era V2 and Cena's winding down making more and more room for the New Generation V2, what comes next is anyone's guess at this point but i seriously doubt it will ever be that same level of evil violence and sex that lasted for 6 magical years.
as for the question at hand,
Owen - woulda stayed relevant as an upper midcarder til his contract expired then he would've left wanting to follow Bret but wasn't allowed out of his contract.
Eddie - woulda been champion atleast twice more, he was scheduled to win again just going on the push towards a face change again b4 he died
Benoit - was never a big thing in Vince's eyes so he woulda been a mainstay always in the title hunt but not often the holder, and maybe he woulda been a lockerroom leader like Taker
Mr Perfect - would've retired he was badly injured anyway
Brian Pillman - would definately have won singles gold, not necessarily the big one but t say he was on the same level that Austin achieved is bullshit, he was good but he was no Stone Cold Steve Austin. he was o par with Stunning Steve no doubt but SC Austin was a completely different tier.