Nobody would buy it tho. Nobody.Wasn't RX 590 around £299 at launch? A Navi card at £250 which matches a 590 would represent a saving for the same performance, so you could argue it would be acceptable
AMD can do what they want, but if they want to sell their cards they can't release a 590 perf card for £250.
So, seriously, what would you have for £250?