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In my opinion, the second alternative is more likely to occur because the following motives: players that like themepark with single-player like content, with instant gratifications, without any risks or loses, in general "consume" the pve content provided by the developers and when that content ends (what is almost inevitable), they DONT obtain fun from the player enviroment allowed by the game itself, but asks for more and more single-player like pve content.
This make more likely they abandon their themeparks (temporaly or permanent) and "invade" the AAA sandbox, without the necessary change in behavior and mentality needed to play a sandbox and handle its enviroment (Ex: social interactions and skills, training self defense and being vigilant and smart, actively dodging dangers, tolerate and understand losses and frustrations, to have a better vision of the whole, less laziness, etc) . This create the perfect situation to little annoyances in the game (thing that they unknows) and they start whining asking for changes that let their enviroment and gameplay less risky and more "self-centered", what, if made, gradually can disfigure the mmo and make it loses its "sandboxiness".