As a likely large source of revenue for Blizzard in Overwatch 2 is the battle pass, it would likely be in the devs best interests to implement a way to help reduce arcade queue times.
In the weekly challenges for the past 3 seasons there has been the “win x* games in any arcade mode” challenge (*was 7 now 5). And I’m not sure for other regions (I’m from Australia so my servers likely have fewer players), but for many of the arcade game modes, queue times are either extremely long or its almost impossible to find a game. This often leads to “win x arcade games” being the last weekly challenge to complete basically every week as I usually end up giving up after about 5 minutes of queueing for arcade because I’ll actually want to play the game and just play QP instead.
A possible to solution to circumvent long queue times is to allow players to queue for multiple modes at once. Off the top of my head a game that allows this is Rocket League. For a game with similar arcade type modes with respective “win x games in arcade” challenges, Rocket League allows for players to queue for multiple game modes at a time, which increases the number of servers that you would in theory be able to join and therefore reduce the amount of time it would take to find a game.
There are likely other ways to shorten arcade mode queue times and who knows if the devs would even consider bothering with such a small issue but this would be my idea to fix the problem and improve the quality of life of the game.