Assuming that the intention was to provoke a serious discussion...
It is obvious that a spare air is not going to get you very far off the deck at 150 feet, especially if you have any intention of doing deep stops. You could get what you can from it and then get to 70 feet with a CESA, the whole time deploying your 50% bottle so you can start breathing it right away.
Of course, I don't recommend that as a dive plan.
I believe Wormil's serious intent was to show that the spare air has no place in technical diving, in contradiction to the statement in the video. I suspect that his point will not be discussed a whole lot because I doubt if anyone who has any understanding of decompression diving will disagree.
BTW....
I used to teach English Literature, and the concept that screws people up the most in reading is ironic tone. This is when the speaker says the opposite of what is actually intended to be understood. A good example of this is Stephen Crane's poem "War is Kind," in which the reader clearly gets the message that war is anything but kind. The most famous example is Jonathan Swift's "A Modest Proposal," in which he offers a solution to starvation and poverty in Ireland: they should start selling their babies to be eaten by the more well-to-do. Eavan Boland's "Anorexia" is a good example, for its praise of anorexia creates the opposite effect in the reader.
The problem is that many people have trouble understanding ironic tone, and take the writer's words literally. All of the examples cited above have been famously controversial because some people thought the speaker was serious and were unable to discern the real intent.
Such is the danger of using such a literary device in a public forum like this. You are almost certain to be misunderstood. That is why people frequently use smilies when speaking ironically.
