The irony here is that the people calling for this don't realize that, if this were to happen, the number of people playing in open would drop dramatically because they simply would never bother with it. I can tell you right now that my experiences in open have almost all been with griefers, and if I couldn't go to solo mode and earn some money first, I simply would never play open. Period.
So good luck with that. Just remember that your calls of "segregate open and solo!" are really calls of "please dramatically reduce the number of people who play open mode."
You're much better off letting us switch between them.
We can cope with quality over quantity. That's fine.
At least it will be fair. No trading your way to vast wealth in solo and then bringing a constant stream of combat ships to PVP in open, gaming the system because it isn't prevented.