No compelling reason for Apple to get into this market...at least not yet. I think the big issue with TV isn't picture quality but user interface and content. These are two things that a set-top box can change and i am assuming apple will start with at WWDC. I don't think the TV service will be introduced until the fall...just in time for football and the tv season.
I think you are right! It is not the TV but the content and the delivery method! I can't see Apple buying Verizon, Comcast or Direct TV because they need something that would work Worldwide! Maybe Apple will put their own satellites in Space?
tv, mostly an app store and the GUI.