Should this air-filter should have been replaced sooner?

I just bought an 05 car from a dealer, and I've been under the hood for several days now , changing fluids, coolants,filters,etc.,etc. My wife is wondering what the heck am I doing. She figures since it came from a dealer, everything is golden. I explained to her I'll have to check everything for myself , because dealers just flip them as fast, and as cheap as they can without a thorough check.