I think it's a given that any Looney Tunes movie is catering to those of us old enough to have grown up watching the shorts on TV, or even in the theater. Although some movies do it better than others.
As for Looney Tunes: Back in Action, I'd say it caters to the Joe Dante audience as much as to the cartoon-fan audience, as it has a lot of his usual trademarks and cultural references (including the usual cameos by Robert Picardo, Dick Miller, Kevin McCarthy, etc.). One of my favorite gags in the film is a callback to an earlier Dante film.
As for Looney Tunes: Back in Action, I'd say it caters to the Joe Dante audience as much as to the cartoon-fan audience, as it has a lot of his usual trademarks and cultural references (including the usual cameos by Robert Picardo, Dick Miller, Kevin McCarthy, etc.). One of my favorite gags in the film is a callback to an earlier Dante film.