When's the last time Dean Ambrose defended his U.S. Title? If you know, you're a better man then I.
The goal of a championship shouldn't be just to make someone look slightly more prestigious because they're wearing it, like it has for Ambrose right now. The goal of a championship should be what Big E. Langston is doing, which is the champion bringing more value to the title by defending it regularly, and doing so against men who had to vie just to be #1 Contender. If you can't find enough time in your shows to make the title seem important because it's being defended or people are vying for a shot at it, it has no purpose in existing. Such is the case with the U.S. Title, as while the I.C. Title has #1 Contender matches and actual Championship matches, the U.S. has neither.
So even if they go the likely route of eliminating the U.S. title, adding another title, unless it was a specialty to some type of demographic, is absurd. If they wanted to do a cruiserweight title, I guess that would be fine, but they turned it into a joke by its end with having Hornswoggle win it. We've seen what happened when TNA had female tag champions, and WWE's current roster of Divas isn't much bigger. I don't think that would work. The Hardcore Title was always a joke, especially with its anything goes mentality. Matches like that should end feuds, not be the normalcy for a division. A TV title would work, I suppose, as long as the person defending it did so a few times a month. But again, they haven't found time to make Ambrose's title one important enough to be defended on TV or PPV, so how would just a TV title work?
The fewer number of titles there are, the more prestigious they are. The more prestigious a title is, of greater importance is the person carrying it. Also, with fewer titles, they're likely to be defended more often and at every PPV, rather then have one like Ambrose's U.S. title, which can't even make it on a pre-show match.
The funny thing is, in a division left for dead a year and a half ago, the tag team division is the only one that carry two titles, and make it work. Unfortunately, the same problem would enter that occured with the World Championship. With no brand split, one would be more valuable then the other, rendering one useless over time as well.
Why eliminate one title only to add another? It seems pretty counterintuitive to the reason the titles are being Unified in the first place.