[Most people] begin to realize that even though they usually experience pleasure when they get what they desired, they want more than just pleasure. They also want to visit Costa Rica and have good sex and help their loved ones succeed.

Actually, they claim to also want those other things. Your post strongly implies that this claim is justified, when it seems much more plausible to me to just assume they instead also want a dopamine hit. In other words, to properly wirehead them, Nozick's machine would not just stimulate one part (liking), but two (+wanting) or three (+learning).

So I don't really see the point of this article. If I take it at face-value (FAI won't just optimize the liking response), then it's true, but obvious. However, the subtext seems to be that FAI will have to care about a whole bunch of values and desires (like travels, sex, companionship, status and so on), but that doesn't follow from your arguments.

It seems to me that you are forcing your conclusions in a certain direction that you so far haven't justified. Maybe that's just because this is an early post and you'll still get to the real meat (I assume that is the case and will wait), but I'm uncomfortable with the way it looks right now.