The digital TV transition
That's complete rubbish -- antenna use will increase, not go away (as some cable companies might claim), as people see huge quality improvements and the allure of free HDTV over-the-air. Instead of paying extra in order to get HDTV channels from Comcast, they'll re-discover the broadcast networks in HD, for free.
Some may argue the argument was for the VHF rabbit ears to go away, not the antenna in entirety, but they failed to note that at least here in Chicago, a major network (WBBM-DTV) broadcasts their HD signal on channel 3, in the low-VHF band, absolutely requiring the use of the so-called "obsolete" rabbit ears. See a long discussion about the HDTV situation here.