The aim is not to drag players against their will into a new mode - it is to offer players who eschew PvP the opportunity to play with other players who share their play-style choice.
And that offer is going to be rejected more often than it is accepted, because you're just creating yet another smaller population within an already divided population.
Of course it would remain up to the player to choose whichever game mode they would want to select each session. Reading the complaints on the forums regarding occurrences in Open, I would suggest that some players who currently play in Open do so as a compromise between a desire to play with as many players as possible and a desire for not being a target for PvP.
Every choice in life is a compromise. Playing ED in general is a compromise. We're compromising between spending our time playing this game, or playing another game, or washing the dishes, or whatever. Expecting players to be able to play the game without compromising is just a jar of fairy farts.
What's next, segregating mouse and keyboard users so that players aren't forced to "compromise" their experience with the game based upon their input devices?
The possibility for such encounters would presumably remain in Open. Why would the money stop coming in? Frontier seem to be well aware that the majority of players do not get involved in PvP, after all.
Pipe dream. Possibility becomes an Impossibility as player populations drop, and the only thing splitting the player base does is cause it to drop relatively for every player. Thus damaging every players' experience.
Every game in the history of the industry has only suffered as a result of dividing it's player base, whether it's through map packs, server variations, or region locking. It is a kick in the balls every single time that is detrimental to the player experience as a whole, and ED has it coming from every angle.
First we divide up the players between Open, Solo and Private. Then we divide them again with Horizons. Next expansion? Cut another chunk off of the pie and put them in another corner where no one else can interact with them.
It's bad game design, and that can't be argued.
Until there is another mode with an unlimited population then I would disagree that PvE players, who eschew PvP, have that option - as the only game mode with an unlimited population permits direct PvP.
Permits, but does not require. There is no difference between permitting Players or NPC's to attack players, it's simply a petty, childish stigma some people develop towards the act of players doing it. If you've got a problem being attacked by other players when you prefer a PvE experience then you are just irrationally separating two identical occurrences for the sake of self-inflicted disgruntlement.
The only way that an Open PvE would make any sense is if it also didn't have a single aggressive NPC, which is completely contradicting everything the game is built around.
Thus, the proposal that Open PvE is a requirement for these players to play the game as they wish is a fallacy. The only requirement is that they either A: get over their silly self-induced aversion to one type of aggression over another identical type of aggression or B: Embrace the full nature of their request and also demand that all hostile NPC's be removed from Open PvE.
Stop being selfish. Stop saying "I don't want you playing in my sandbox because you have a CMDR in front of your name, but it's alright for everyone else to attack me."