Not currently, but I think we'll see it again very soon. Granted, this is just my opinion, but the game of baseball is cyclical, and we see a team attempt something that works, then every other team follows suit until one team out there decides to try something else to be different from the others, and when that works other teams adopt that method.
I think that as new general managers enter the game, there will be that one guy who will eventually say, why am I paying $4 million to a middle relief pitcher who only pitches 70 innings a year? I could use an extra bat on my bench, and we have a glut of good starting pitchers and prospects, I could put this one guy at the back of my bullpen for 2-3 innings a few times a week and we could cut down on needing that extra pitcher while providing an extra bench spot for someone.
Like I said, I don't see it happening in the next couple seasons, but I can see this type of thinking creep back into the game, and it's something that personally, I'm looking forward to.