This article is so strange in its discussion of the "cul de sac" that Gilbert wrote into the ending of Monkey Island 2, to "sequel-proof" it deliberately. Rot! For people who haven't played it, (mild spoilers coming up soon, in just a moment, as soon as I close these parentheses) the final shot of the game literally has the older brother mug the camera (behind Guybrush's back) while his face morphs back to LeChuck's ghoulish grin and some decidedly unnatural magical flares and sparks dance around.

(Spoilers mostly done)

The entire premise of Guybrush being trapped in an illusion cast by LeChuck was already baked in. And I think that helping Guybrush realize that and to escape could've been an excellent first chapter of a third game, but unfortunately the designers decided to basically handwave the whole thing and start the their story back in "reality".