Times change, people change, and eras change as well. Sometimes for the better and sometimes for the worse. I think it had to do with a lot of the general population and what THEY wanted. Who wants to watch a 3 hour wrestling match? You had other sports come along that weren't so time consuming, boxing and baseball come to mind.
You might find some athletes today that honestly posess some of these traits. Most of them are also-rans.
It was always my opinion that Sandow was a fraud. If you have to go to court to prove yourself, you've already lost respect right there. Saxon proved himself time and time again, even to people like Donald Dinnie. Grimek was undefeated as a professional bodybuilder, and yet hardly anyone knows of him.
Possibly. They knew that strength was a very big part of bodybuilding, but it was a piece of the pie. Unfortunetly, bodybuilding back in the 70's didn't pay jack squat, and a lot of those guys had to do other gigs just to make ends meet.
Bruce Lee was an amazing specimen of human endurance, speed and skill. But remember: he was an actor.
Arnold also did a bit of acting, figuring out that bodybuilding was a stepping stone to bigger things to come.
Because it's way too much to do all of that and still be remembered for being good at just ONE thing. If you throw up a name like Ronnie Coleman, my first response is that he's a well-known bodybuilder. Same thing for Dorian Yates.