Here's what I think:
Before anything, end the roster split. Still have 2 shows (Raw and Smackdown), but have everyone eligible to take part on both shows.
Unifying the Womens/Divas title is a good move. End of story.
Unifying the Tag titles was also a good move. WWE don't have enough tag teams as it is, 2 titles was too much. They should now go on to build with the tag teams they have now, add a couple more, and they'll have a good competitive tag division.
Unifying the WH/WWE championships is also a good move. With no roster split, all the 'big guns' will be vying for places in the main event.
Unifying the IC/US title is a bad move. WWE have so many mid card wrestlers, they'll have nothing to fight for if there isn't a title for them. If you end the roster split, WWE will have about 40 wrestlers idle! I would like to keep both of these separate, and I would also be in favor of adding another title to the mid carders. I would bring back the Light-Heavyweight or preferably the Cruiserweight title back. WWE have enough talent to compete in a cruiserweight division; Evan Bourne, Daniel Bryan, Chavo Guerrero, Kaval, Rey Mysterio, Yoshi Tatsu, Christian, Matt Hardy (if he gets back in shape) etc. Then you have plenty of guys to compete for both the IC and US belt (Cody Rhodes, Ted Di-Biase, Drew Mcintyre, Zach Ryder, Mark Henry, William Regal, Goldust, MVP, Jack Swagger, R-Truth, John Morrison etc), and even the 'big guns' that are not involved in the world title picture at the time can compete for these.