The problem is that there isn't fierce competition for WWE anymore. WCW really made its mark and forced WWE to come up with something brilliant in order to survive. Although WCW might've self destructed anyway, that nWo thing became completely ridiculous and Goldberg was just a shallow and skilless hack like Warrior.
I don't think the fact WWE doesn't need to beat head to head competition anymore is the only culprit.
The territories are gone. Most of the big name guys had a decade of experience before coming to the WWF and it wasn't in high school gyms. They aren't buying up all their competition and getting their top young guys in their primes (I guess they could buy TNA one day and get those guys). A lot of guys who are gifted athletically and physically imposing that used to do football or amateur wrestling now go into MMA instead of going into pro wrestling. As such, they hand pick kids, send them into development, and drop them into their shows after a couple years, if that. People don't make it to the top because they have all of the looks, the physical skills, the ability to get themselves over, or have the will, love, and desire for the business.
You still have some guys who have all of the above, but their numbers are smaller and smaller every year. It's not that none of the guys around now couldn't have made it big in the Attitude era, it's that the crucible that made guys reach their full potential isn't really around anymore. The Attitude era was a convergence of a bunch of different factors happening all at once that I don't think we'll see again.
Just spent 6 attempts trying to do a Jericho challenge. Had to do a liontamer followed by a power bomb through a table in 4 minutes. I screamed, I cried, I was relieved I'll never have to do it again.
I posted about this in the other thread because it is hardest mission to complete (primarily because the powerbomb has poor collision detection with the table).
The best way to do this is to hit the Liontamer, release, do the three powerbombs to keep him down, set up a table in the corner, irish whip Road Dogg into the table, press the strike button to pull him off the table, then do the finisher powerbomb to put him through it. It's the best way to get everything to line up.