You do have a point on that they CAN use the 3 hours effectively, I won't argue that.
Don't like discussing history but there's a reason many fans reminisce about the year Austin was hurt. Austin went down, and not only could he just hand the baton to the Rock, but then up came Triple H and Kurt Angle as new stars for the company. And even with Bryan healthy, there was still a lot of debate about "why can't they find anybody for him to feud with, with all the great talent on this roster?" It just doesn't make sense.
Think both WWE and the fans should stop picking guys apart. "Damien Sandow doesn't have a main-event gimmick" Yeah, why not? That ship has probably sailed at this point, but it's worth giving him a shot up there. Same with so many other guys, but so many of them are probably too damaged at this point.
I think it's as much that the modern IWC fan often simply gets into a guy too quickly, then it becomes hip to hate that guy after every flaw he has is pointed out and heavily pushed (witness: Sandow, Damien; Punk, CM; Bryan, Daniel......I've already started hearing rumblings about Roman Reigns' shortcomings and I'm just waiting for people to start hating Bray Wyatt.....you know it's coming). By the time most guys have broken through to the main event scene, the IWC already hates him because it's "edgy" or "hip" to do so.
As for me, I would love to see Sandow, Ziggler, etc., pushed to the ME scene. In fact, I'm willing to make a bold prediction that the MITB briefcase will be won by one of those guys and not Cesaro.
wk