IMO opinion dolph shouldn't win the rumble to set up a likely unification of the titles. Ok, yea one may argue that two titles makes the title less significant but it doesn't. What makes the title less significant is that their isn't a proper brand split where superstars just stay on one show, it's not as cool if you always have champion vs champion matches, it gets stale like anything else would. I do however agree that they should unify the two midcard championships. I liked your idea of bringing the cruiserweight title back, and that would make sense because alot of wwe's current roster is under the 220 pound limit that is "required" to wrestle in said division. I think with how much current talent is on the roster you need a second world title though, for feuds sake... The title is often used as something that makes two superstars collide... there is nothing wrong with giving your creative team another angle to push a rivalry/matchup.
