On the contrary. Picking a fandom everyone is familiar with might help with the consistency and ease of access in the persistent world. I've avoided Expanding Horizons because it became such a hodgepodge mess. The characters can be literally anything. A demonic dragon, a literal god, a talking hat. It was absurd. Absolute chaos.

It's been more or less proven that an original world can't work on here. Trying something old like Star Wars is the best shot at trying something new.

With the right management and guidance, a Star Wars PW will be a lot easier for everyone to manage and get on board. I'm not a big Star Wars fan, but I am familiar with the setting, so I'm pleased to hear about this.