I think a global agreement is to never force anyone. But creating interesting choices is what is missing. Will a player choose the risk of becoming a victim in Open for a huge payout? Or will they choose a standard payout with risk minimized by filtering out any adversarial player interaction (solo). Open vs solo are not equal and the recent Titan black contest showed that goals, risks, and rewards can be seperated. The precedence was set there.Any solution that relies on players choosing to be become your victims won't work and any solution that forces players to play in Open isn't fair and goes against the core design of the game. They both also ignore Solo pirates.
I look at those modes as just risk filters, but with no reward change.