The Attitude Era to me will always be the best days of wrestling and these are a few reasons why. It's possible to recreate these days while still maintaining the PG feel WWE wants.
FACTIONS: There were strong factions like DX, Corporate Ministry, Nation of Domination, Corporation, Ministry of Darkness, The Brood. All these factions had legit talent with each member involved in meaningful feuds over pride or titles. Example: The Nexus could have 2 going for the tag team titles, one for the intercontinental, and Punk for the world title.
TAG TEAMS: The tag team division allowed there to be more stars included in one match taking up less time than individual feuds. Example: Having The Hardy Boyz, Edge and Christian, The Dudleys. Lots of talent that was seen each week in meaningful matches. Tag teams was also a way for stars to rise. The Rock, Kane, Big Show had good runs in tag teams that pushed them to their singles career. In the WWE today there is basically no tag team division. You can have teams like Daniel Bryan & Evan Bourne, Zack Ryder & Primo, Members from The New Nexus, etc. We would be seeing great talent actually being used.
Here are a few suggestions in setting that up:
Women's Championship: They just need better stories and a great place to start would be having the women be managers for the men. Get more exposure for the women and you can have the title on the women with more of the successful men.
Tag Teams: Justin Gabriel & Heath Slater, Daniel Bryan & Evan Bourne, Zack Ryder & Primo, Santino & Yoshi, Ted DiBiase & Chris Masters, David Otunga & Michael McGillicutty.
US Championship: Alex Riley, Mason Ryan, Sin Cara, Drew McIntyre, Ezekiel Jackson
Intercontinental Championship: Wade Barrett, Jack Swagger, Dolph Ziggler, Kofi Kingston, Cody Rhodes, Sheamus
World Championship & WWE: Alberto Del Rio, Christian, Big Show, Kane, John Morrison, R-Truth, John Cena, CM Punk, Randy Orton, The Miz
Within these championship guidelines you can have 2 to 3 in a feud for the title and then 2 to 3 in a feud to become the #1 contender for each title. Have #1 contender matches for the Tag Team, US, and Intercontinental. It would bring more value to each title. People fighting for the shot at each title rather than just being able to get a match.
A lot of the top guys don't even need the title or a shot at the title. In the attitude era there were several times when Austin was in a feud with Vince or the Rock, Triple H in a feud with Jericho or the Rock when the title didn't even matter, but they were still on top. These guys could be Cena, Orton, Big Show, Kane...they are capable of having feuds with no titles, but still have meaning and still be superstars in the WWE.