I have said other times in the past WotC will have to choose if they are going to allow other classes in the setting, for example ki martial adepts.
We don't know the level of fear about any possible toxic lobby. Maybe it is not our fault at all, or by WotC, but troubles linked with a new wave of moral panic could cause serious economic damages. Other potential controversy is the climate negationism. Here it is not fault by WotC but DS could be used as a satiric allegory by both sides. I repeat, the IP can suffer a serious damage in the prestige because it could be used as a propagandistic weapon by both sides.
The main reason for the delay is the "crunch" is not ready, and we have to await until the event with Vecna because WotC may be planning a reboot of the D&D multiverse.
Other reason is if WotC wants the lore of DS to allow space to create stories about warlords and their armies. And these not only need weapons and armors, but also water, food, medicines.. Have you played any strategy+citybuilding videogame?
Maybe it could return if Paramount believes it is too interesting to not produce an adaptation.