At the very least, something like this should be available for custom games. The blizzard idea, deep snow, mud etc were great but poorly executed. Instead of forcing you to switch to a different type of playstyle and giving your different tactics, they either took away half of what you could normally use or were just poorly communicated. If Relic as proper ideas, I'd be happy to have something like this in automatch. If it end up being tacked on like blizzard, then rather not.
It might be though that these events need a slow down of gameplay in general. It must be worth to invest time to properly prepare for those during the normal game, which is only possible if not every second is crucial. I doubt this will happen.
Imo they won't ever return outside of special campaign mission because MUH COMPETITIVE NO RNG ENVIORNMENT notion that pushed the feature out of mp in coh2, don't count on elements removed here to return in 3.
The blizzard was poorly implemented though. Campfires were okay, but in the end blizzards mostly stopped infantry fights, especially in the early game. Transports were also poorly suited to counteract blizzards. In the end it just removed core mechanics without giving back.