Would actually laugh pretty hysterically if Big Navi floors 3080 and nips at 3090 while costing less than 3080 and using a lot less power, would be a total reversal and game changing moment.
And herein lies the problem: AMD won't price a 3090 nipper less than the 3080. They probably wouldn't charge the full £1,400 for it, but however "disruptive" AMD want or claim to be, they won't be disruptive to their own profit margins or shareholders; those leeching trash bags will kick TF off if AMD "give away" a 3090 beater for 3080 money.
AMD must play the price-performance game whilst navigating the tricky waters of mindshare, perception and their own "we're not a budget brand" foot-shooting.
Add to that, there isn't actually much of a gap between 3080 and 3090 performance, which can make pricing more difficult. Consider these simplified numbers:
3090 is 20% greater than 3080, 3090 is £700 more expensive than 3080
6900XT comes in 10% greater than 3080: how the hell do AMD price that?
Shareholders would likely want it to be £1,299 (which is 70% of the price delta for 50% of the performance delta), mindshare (or lack thereof) would almost demand it be £899. AMD might go for £999 but that would **** of both parties.