To be honest, it surprises me that workshop is not already in the game.
Many peoples suggestions are generally new characters or new cards. This could be easily added with work shop AND take the load off the team on adding them themselves and letting them work on the things that need to be in the game.
Maps and game play changes (and possably game modes? I am not really sure how work-shop works lol) could also be added with ease. I know that many talented people would be HAPPY to add to this game with their skills to help the game grow and let the dev team not have to feel like they will never catch up with the requests.
I am not sure how hard it is to add workshop support but I ask that the team at least thinks about it. I know that I would be very happy about this being in the game