I admit I havent folowed Warhammer Fantasy that closely in the last years (being a 40K person) so someone might correct me, but it was my understanding that the world in which WHF took place was litteraly destroyed and ceased to exist - there was a series of novels published by Black Library that dealt with the whole thing. I didnt read those novels but I saw some TLDR summary and IIRC the Empire was pretty much overan by all the baddies (like Skaven conquering Nuln and such) and then there was some kind of a fight between the gods that destroyed the world itself.
So I would say that WHF is a dead setting and it was replaced by Age of Shitmar as a prequel, because WHF sales werent that good (this was however largely GW´s fault due to highly complex rules, bad balance between armies and poor support in general) and also because of the IP/trademark problems that werent as easy to solve as in case of 40K (ie you can rename Stormtroopers to Tempestus Scions, but they could hardly rename stuff like Empire or Greatswords, so they came up with Stormcast Eternals etc instead).
Regarding the reboot, GW announced Warhammer: Old World in 2019 with expected release in 2022 - this should bring back WHF with new army books and minis, we will see if they retcon the end of the world story-wise or not. In any case Total War: Warhammer was likely the main reason for this reboot, as it shown that the setting can be popular if marketed properly.