Surely the TV manufacturers didn't replace TVs or recorders that lacked ATSC tuners when that time came. I'm pretty sure cable companies don't replaced owned cable boxes when their technologies change. If I need a DOCSIS 3.0 cable modem, I'm on the hook for that. Apple didn't replace 680x0-based Macs when they transitioned to PowerPC and subsequently Intel based Macs. The consumer electronics industry (with the exception of subsidized wireless phones that are effectively leased anyway) doesn't operate the way you think it should and that's not likely to change.