At the end of 2013, the WWE unified their WWE Championship and World Championship belts, with Randy Orton beating John Cena to create the WWE World Championship title. According to Rajah.com on Jan. 12, the WWE plans on doing it with two other belts as well.
With the brand extension over with and only one world championship, the WWE said that they wanted to make the Intercontinental Championship important again, like it used to be. Back in the 80s and 90s, men like Randy Savage, The Ultimate Warrior, Bret Hart and Shawn Michaels all held the Intercontinental title and used it as a stepping stone to the WWE title. These days, the title has not meant much to those holding it.
The WWE Championship was the original world title that Hulk Hogan and Bruno Sammartino held. The World Championship was the old NWA/WCW world title that Ric Flair and Harley Race used to hold. In the same way, the Intercontinental Championship was the WWE's secondary title while the United States Championship was the NWA/WCW's secondary title.
The talk backstage is of having the Intercontinental Championship, currently held by Big E Langston, and the United States Championship, currently held by Dean Ambrose, unified at the "Elimination Chamber" pay-per-view in February.
That would give the WWE one world title, one secondary title, one set of tag team titles and the Diva's title as their total combined amount of title belts. The plans are not set in motion yet, but with the WWE World Championship unified, there is little reason to keep two secondary titles as well.