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But then what becomes of 1080i and 720p; they are no longer needed. What a concept? Only one high definition standard.
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As far as I know...
Terrestrial broadcasting will likely stay 1080i + 720p. To change all receivers (again) likely will not happen... at least for a few decades.
Cable (and other delivery methods) might move to 1080p50/60, but this will require a compatible set-top box.
My guess is that SD broadcasted digitally will stick around for some time (much like how AM is still around).
2- With AVC compression, 1080p50/60 may deliver slightly better quality at the same bitrates. (I've not seen this for myself.)
3- From a production standpoint, most facilities are wired for 1080i/720p. The higher bandwidth of 1080p60 requires 3gbps cabling.
It would also require VTRs that support that, and other infrastructure (e.g. routers).