But what if it's not enough fidelity?!?
Seriously though, it's looking good for what they've taken on. I had been following these guys since they were attempting an MMO back in 2006-ish. They definitely spent way too much time on that before figuring out it wasn't doable. On the other hand, at least they didn't bilk people out of 160 million dollars while figuring that out.
PS: They built an engine themselves that actually works for the kind of game they're doing. Who would've thought?