Rick dead doesn't make the show more interesting in my opinion.
It would be a hell of a lot more interesting because it's the hard choice and forces the writers to really keep a drama series fresh.
I'd compare it to Boardwalk Empire. SPOILERS to follow...
In that HBO show, one season the writers sort of wrote themselves into a corner with a big beef between two main characters, Nucky and Jimmy. The easy way out would be for them to somehow magically forget the deeds of the past season, work out a deal and keep both popular characters. But... they didn't and one of them killed the other. The show lost a very important, very main character.
One last thought, what shows and movies are you watching where it's less obvious who is and isn't going to die in each episode? Because I haven't seen them.
Second example, Game of Thrones. SPOILERS to follow...
EVERYONE that I know who has watched that show is totally blown away by the death of a main character towards the end of season one. Killing Rick would be almost exactly like killing Ned Stark (the main character of Season One). Right now this is the #1 show where anyone can die at anytime it seems.
Maybe Kirkman has said it's "Rick's Story", but he's also said the TV show and comic are two different things... killing Rick and letting the TV show focus on Carl (yuck) or Daryl (yay) would immediately up the ante for a new perspective as well as making you wonder if someday Carl/Daryl would be killed to make way for Michone or Tyrese or whoever to take a turn...