this is stupid.
i'm not even going to go into your analogy, because it is just a disaster. you're inconsistent within the analogy, not to mention that it doesn't apply.
but, if there was a substantial chance that they would be unable to deliver on the promise (which there definitely was, even without hindsight), he probably shouldn't have made that promise publicly. pretty irresponsible of him, don't you think?
also, i misspoke when i said the word 'fact'. replace 'fact' with 'guarantee'.
personally, i think 2.6 ghz is plenty fast, and will likely beat out most, if not all, competition. it's just stupid of steve jobs to publicly say they would get to 3ghz, and then not do it. it adversely effects his reputation as a businessman, his companies reputation, and probably adversely effected sales. but, we still may see them, so we'll just have to wait and see.