OP I'll wish right with you but if you consider past evolutionary steps, before a newTV gets that kind of upgrade, at least the iPhone needs to be shooting 4K. That probably comes with storing such shoots as h.265. The hop to a 1080p
TV (3/7/12) was preceded by iPhone 4s (10/14/11) going 1080p many months before. I would expect Apple to formally roll out a 4K iPhone first or, at best, simultaneously (though I expect the former).
As to the flash drive option, I'd much prefer normalizing the USB port so that just about any size of local storage (including fat hard drive or even raid storage) could be attached by those interested. Since the existing model already has a (not normalized) USB port, it seems like a more favorable scenario to accomplish what you (and I) want.
All these people talking about the lack of 4K (and 1080p) sets in place, etc are doing the same thing people were doing when some of us were wishing for a 1080pTV: "not enough bandwidth", "not enough storage", "until everyone has 1080p sets", etc. There's nothing wrong with a company like Apple taking a step ahead of the masses. Just as a 1080p
TV could still flow 720p and SD to TV sets that couldn't play 1080p, a 4K
TV could still flow 1080p, 720p and SD to TV sets not capable of 4K. Some part of the chain must step ahead to eventually motivate the masses to upgrade. We wish for "latest & greatest" in every other "coming soon" Apple release and then gripe if Apple didn't put the latest "wow!" into something... except this one thing, where we seem to take a view of waiting until everything else is completely in place and updated first and THEN it will make sense for Apple to go there too.
H.265 was snuck into iPhone 6/plus for FaceTime. So hopefully this is enough for the next step.
http://www.streamingmedia.com/Articles/News/Online-Video-News/Apple-Supports-H.265-But-So-Far-Only-in-FaceTime-on-an-iPhone-6-100392.aspx