Why are PvP only tasks in the pool at all when it doesn’t seem to be the design intent behind the revamp?
For many people nowadays, even casual PvP is a departure from “playing the game normally”. This is sort of a high altitude problem for the game as a whole, yes, but “forcing” players in here seems to go against your specific design goals. The existence of causal PvP for people that “don’t want to do ranked” does not alleviate the problem that these people don’t want to face player constructed teams, period, (most often cited reasons are massive Elementalist hero or self looping teams that start from a single mana match and then are basically a cutscene if they weren’t frozen), and refreshing the easiest team with gold to beat pushover/self destructing teams solely for a campaign task is both not good gameplay and seems to be the very kind of play pattern you were trying to avoid with this revamp in that they would only do it because of the campaign.