I really hope they will add the 100% chance, too...
I've done Weeping City over 90 times over the last 2-3 weeks. The queue times are horrible (depending on the time it varies between 20 minutes and 4 hours), most of the runs are pretty stressful, the minion drops every 3rd run if you're lucky and then you have to roll against up to 23 other players.
If I'd farm a doggo, I could exchange the tokens, but now I'm standing there with nearly 99 tokens and can't do anything with them.