I don't understand the arguement about solo players not willing to pay a sub. How is it any different than paying for dlc pack? Play the main story and do extra stuff you want, wait for the next major patch then pay 15 dollars to do the new "dlc".
Not that different from paying 60 dollars for a game and extra 10-15 dollars for extra story and content dlc packs. ie Nioh 2 and its three DLC, or even Dark Souls 3.

This behavior is what Yoshi even encourages. Pay to play what you want, then drop your sub until more content you want comes out. He doesn't want to foster mono-gamers.