I only ever play in Open.
I doubt
very much, however, if I would join an "Only Open, Like Everr" game mode unless it was that Iron Man concept.
So why would I not join an "Only Open" mode, given that I only ever play in open?
For the simple reason that I'd expect to meet 100% of the eve-tastic intergalactic ego gods, spouting "toughen up, princess", "get out of our space, scrub", "another dumb pubbie, blah blah", "learn to play, blah blah", "never come here again, we have your name, blah blah", "You're on our clan KOS list, blah blah", etc.
Today, in Open Play, I meet and interact with all
sorts of players. I help them if they need it, fight them if appropriate, flee from them if required. I never know who I'll meet, or what their background and playstyle is likely to be. But the vast majority are fun, don't trash-talk, don't talk gang crap, and it's great.
I have zero desire to see a game mode where the predominant player type is one who "role-plays a murderous at".
See you in Open... until Iron Man comes along (if ever............)