I know that crapton and importantnobody have tried in vain to make an viable multiverse setting. Neither one has done well. With the potential of having user-run worlds, the concept of a multiverse setting for the arena becomes more viable. Even with a small handful of players a multiverse for the arena is possible. The entire project hinges on the interest and involvement of the players. 

So my questions are: 

What caused the lack of interest in the prior attempts?
 
 Did a lack of a true multiverse setting, which is unrestrained by the contradictory limiting factors of crapton and importantnobody's kill interest?
 
 Did the lack of overall focus kill interest?

If you have an idea or want to comment please feel free. I am trying to gauge interest.