I believe that the probability that SI's concept of "Friendly" vs. "Unfriendly" goals ends up seeming essentially nonsensical, irrelevant and/or unimportant from the standpoint of the relevant future is over 90%.

It seems like an odd thing to say. Why take the standpoint of the "relevant future"? History is written by the winners - but that doesn't mean that their perspective is shared by us. Besides the statement is likely wrong - "Friendly" and "Unfriendly" as defined by Yudkowsky are fairly reasonable and useful concepts.