What i would like to happen would be to go back to having just one roster and releasing Yoshi Tatsu, Vladimir Kozlov, Zack Ryder, The Great Khali, Ranjin Singh, Tamina, R-Truth, Mark Henry, The Bella Twins, Tyler Reks and JTG from the roster to be replaced by Tyler Black, Richie Steamboat, Tito Colon so that the first two could be used in the mid card and Tito Colon could be paired up with Primo as a tag team.
I wouldn't release either of Tyson Kidd or David Hart Smith because i would put them back together as a tag team as well and also i would keep The Uso Brothers around so that there would be four tag teams with The Core also being around but then i would like to see Trent Barretta paired up with someone. In having one roster we could see a proper tag team division happen because whoever doesn't get tv time on Raw could on SmackDown instead and those teams i have mentioned could provide a very good tag team division.
With only Richie Steamboat and Tyler Black coming up from FCW it wouldn't completely overload the mid card which would consist of Kofi Kingston, Cody Rhodes, Dolph Ziggler, Bryan Danielson, Drew McIntyre, John Morrison, Evan Bourne, Chavo Guerrero, Jack Swagger and Chris Masters. Sometimes less is more and i would always take quality over quantity every single time and the fact that the brand extension is pretty much meaningless now because there are no single brand PPV's and SmackDown wrestler's seem to turn up on Raw every week anyway means that everyone of this mid card would available to work with one another.
Another thing is The Undertaker and Triple H are very close to the end of their WWE career's now as is Kane so having a single roster would help in building people like Wade Barrett, The Miz, Sheamus and Alberto Del Rio up properly so that they are fully established and fully ready to become fixtures in the main event scene once those three aforementioned names have retired. That would leave a main event scene of John Cena, Randy Orton, Triple H and The Undertaker until they retire and also Kane, Alberto Del Rio, Edge, Rey Mysterio, The Big Show, Wade Barrett, The Miz, Sheamus and CM Punk with Dolph Ziggler most likely to be the next to step up from the mid card but that is just what i would like to see happen.