It's his 'Thank you' run. I like it, Sheamus had a good long reign and now it will be fun to watch him chase the title.
While lengthy reigns didn't happen back then anyway, when Stone Cold was at the peak of his popularity he never held the title long. The reason for that was because he was better chasing the title than holding it and I think it is the same with most faces. That's not to say they shouldn't have a long run with the belt, because if they are good enough they should have that one decent lengthy reign but they are usually better chasing the title.