/devilsadvocate 1
Suppose they end up creating two game worlds that only 'touch' where PvP is enabled.
In that case I think it could be really interesting, and paying separately would not be anathema.
For one thing, it would really foster and intensify the rise of two distinct communities: Heroes and Villains. In too many PvP situations, the conflict just comes down to the same people on different toons. Playing a particular faction is a trivial decision and has no consequences. Having two nearly independent games running in the same multiverse, each accomodating an opposing faction is exciting.
The expectation of course, then, is that CoV would need to have at least as much content for PvE villains, arcs, etc. as CoH. Otherwise it's a hose.
It would also require that CoH features not be rolled into CoV and vice versa, but as long as you didn't need to own both in order to participate in PvP or gain full access to your faction's feature set, I wouldn't see a problem.
I'm not saying I think they'll do any of this; the point is just that I can imagine circumstances in which separate subscription fees could be appropriate or at least acceptable.
DG