The main flaw I see in your argument is that they'll release a 1080ti at <£700 and drop the 1080 prices appropriately, why would they lower prices? There is absolutely no competition at this top-end and the 1080s are still selling fine at ~£650. I expect a 1080ti just in time for Christmas and I think it'll be ~£800 here in the UK. My thoughts atm are my pre-ordered 1080 at £525 is probably worth keeping but perhaps I don't bother with the waterblock and just swap out for a 1080ti when they're out. Just won a 980ti with waterblock on eBay for £320 though so maybe I'll just keep that and cancel the 1080 completely!
too many options, I don't know what to do! Fyi I play on 1440@144Hz, and a few games on 7868x1440 (with bezel correction), so I do want/"need" the 1080 power.