Yeah, clearly he can still shine in something like 12 Monkeys, Pulp Fiction, Unbreakable, and Looper. But they aren't by the numbers action movies by any means. He does seem bored with traditional action fare, and as Vern says in that article, it's kind of funny how he has transformed into what movie studios perceive as a traditional action star, since he wasn't that at all when he started out. He was about as far removed from First Blood Part 2 Rambo as an action star could be. As a-dev says, Die Hard is a classic, and I'm sure part of the reason was that it was so fresh and different from everything else. The last couple of Die Hard films just seemed to be him showing up for a paycheck. Cashing in on the goodwill he has earned through earlier, much more interesting films.
I am still a Willis fan, but I want to see him in more creative movies like Looper that are worth the time to watch. And the impression in his interviews is that he feels the same way. His attitude toward Expendables 3 makes a lot of sense from that POV.