My main fear is that any potential conflict or interest humanity might get is going to be undone by Anduin swooping back in to save the day. And Turalyon or anyone else will be villain batted to make Anduin look good.
If there were to be another Alliance effort on Lordaeron, i’d prefer it be somewhere else in the former kingdom than Undercity again because i have no desire to see a 3rd failed attempt at claiming the city only to see the Alliance have another humiliating defeat. I think two interesting options though could be Stratholme or Tyr’s Hand. Both being holy cities in their own right and cities that were part of Lordaeron. There’s also room there if you wanted to make one one of those cities where Turalyon’s family was from or had a lot of power in. We know he was a Noble of Lordaeron but we don’t know much of his land or house beyond that.