Sandbox doesn't mean a game is pro or anti PvP or PvE. Nor does it mean a game that is defined and shaped by the players. A sandbox game just meas it is an open world. There is no linear progression of zones or areas. Sure some places (like anarchy is supposed to be) are far more dangerous than others, but that's it. A non sandbox game would be, for example, you start in zone A > B > C > D or E > F > G > H > I or J > K or L > M > Riadtime. A sand box would be rather A > Anything you want, though some areas would be far better at your skill level/money/etc.
If I am mistaken in my belief that "Open World" and "Sandbox" are two distinct (though perhaps related) concepts, then I apologize.
But, we've gotten off track for this thread.
Mobius now has 6200 members, and we've heard from a few people who only discovered mobius from this thread. I think there is substantial value is offering an official PvE option, given that many of us who
read the forum have already voted with our feet and joined; and, given that Mobius is constrained by poor administration tools and is a single point of failure.
I don't think the player base will be any more divided than it is now. In fact, I believe it will reunite all those people who the PvP pirates constantly complain have run off to Solo.
Two things could keep us PvE-ers in the game once we "get our conda" (get tired of the grind)
1. The stuff we've created, built, and are proud of (and can keep building/extending/improving).
2. The friends we meet and our social connections
Given that 1 is really not possible or designed to be part of this game, player retention rests on 2. Give PvE players the ability to meet friends and form bonds, and the player base will reward you with their loyalty.