To use a counter example, consider Catholic priests who do not marry or raise children. It would be quite the argument indeed to suggest their lives are without meaning or purpose.

Aha, you might say, but they hold leadership roles! They have positions of authority! Of course they have meaning, as they wield spiritual responsibility to their community as a fine substitute for the family life they will not have.

To that, I suggest looking deeper, at the nuns and monks. To a cynical non-believer, they surely are wanting for a point to their existence, but to them, what they do is a step beyond Maslow's self actualization, for they live in communion with God and the saints. Their medications and good works in the community are all expressions of that purpose, not the other way around. In short, though their "graph of contextual meaning" doesn't spread as far, it is very densely packed indeed.

Two final thoughts:

1) I am both aware of and deeply amused by the use of priests and nuns and monks to defend the arguments of a nihilist's search for meaning.

2) I didn't bring this up so much to take the conversation off topic, so much as to hone in on the very heart of what troubled the person I originally responded to. The question of purpose, the point of existence, in the face of superhuman AI is in fact unchanged. The sense of meaning and purpose one finds in life is found not in the eyes of an unfeeling observer, whether the observers are robots or humans. It must come from within.