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This is indeed an interesting question. Another factor which should be considered is the technology progression in consumer electronics. Up until the late '70's, consumer electronics equipment construction facilitated repair. Service manual organizations flourished, local TV repair shops were numerous and replacement parts were made readily available for fixing TV sets.
Since consumer electronics is now considerably more sophisticated and the manufacture has now migrated overseas, the chances of extending the natural life of a post year 2000 TV will be more difficult. Early sets will still need a signal and as interlaced 525 NTSC video remains available, it is a relatively simple matter to get it into an old set.
I forsee in the not too distant future that there may emerge a "chronological gap" of working TV sets between older simpler TV technology and the newer sets. On the other hand, maybe the newer sets are just that much more reliable and will continue to run?
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