Persistent World roleplays that have an entire subforum dedicated to them will [i]never[/i] work on RPG, it is statistically [i]impossible[/i] to come up with a setting and plot that will allow [i]everyone[/i] to play. SW PW is prime example of this: you alienate a shit tonne of people who don't care for SW, they then alienated a shit tonne of interested people through the era they choice, and the remainder was, effectively, bullied out, until there was barely enough people left to make it a "normal" RP much less a large persistent world RP. There was 1 active thread at any time and that was mostly a self contained group of people.

You cannot find a setting that interests [i]enough[/i] people on RPG, because RPG is incredibly diverse in the topics people roleplay about, unless you make the setting so incredibly broad that it becomes uninteresting and provides no plothooks for anyone. 

There have been so many discussions about this now that I've even lost all interest in arguing about it, but the crux of it is that both SW PW and the first PW we had were grossly mismanaged, there wasn't enough players (and there are even fewer active members on RPG now, so you will never even come close to the same level of members in any PW) and there were no clear plans for any of the PWs. We could chalk this up to the alleged hateboner I have for PW's but you can ask any player that actually played in the PW's and they'll agree, because I've asked a bunch myself. Neither should have been allowed to become a thing but they did, and perhaps they could have worked, but not on RPG. This is just not the site for it. For a great number of reasons.

I really wish we'd stop pushing time into a project like PW's when nobody on RPG has experience running one, nobody has the drive to do it, and the people who do have the drive for it are not the right people for the job.

EDIT: I also just realized that none of the PW's we've had so far were actually PW's and were gross misinterpretations of what a PW is supposed to do/be. There's a reason you only really see PW's on very large forums or on forums dedicated to a specific fandom.