...coming from a guy who- in that other thread- admits that his TV is capped at 720p max resolution and he only buys the SD version of movies to save the cost for "holiday".
I'm one of those "anyones" who will upgrade, probably buying 3 even if the only change vs. version 2 is 1080p. I'm one of those "almost no ones" who will find 1080p hardware very useful. And I'm not alone.
It's fine to feel as you do but you shouldn't assume that you represent "everyone" and you shouldn't sling around comments like "almost no one" unless you have surveyed everyone on the planet and can thus write such stuff with confidence. There's a fat pool of people who have refused to buy gen 1 or gen 2 because it was capped at 720p. Now they can get what they want too. They won't all be wrong or no-ones because they buy this new model.
Lastly, it won't be a nice upgrade solely for those jailbreaking and using Plex. iTunes stores and plays 1080p just fine (has for years now). Every video shot on an iPhone 4s, probably this new iPad3, and all of the 1080p camcorders can be processed with tools like iMovie and dropped into iTunes (no Plex required). Every 1080p blu ray rip can be dropped right into iTunes and plays there just fine. Pretty much every movie, TV show, 1080p home movie, probably a group of (soon to be) 1080p Podcasts, 1080p Youtube, etc will all "just work" without even having to jailbreak the thing. Yes, those who jailbreak will enjoy the added graphics horsepower too... but they won't be- and don't have to be- the only ones.