One of the best (IMO) scenes in ASII was when Ken Danagger is confronted by Dagny just before he disappears. It was a great opportunity to launch a conversational speech, not between adversaries, but between friends.

I think this sort of device should be employed in ASIII. The link provided is to a four minute example of a fascinating speech by Walter Pidgeon in the 1948 Command Decision. Just think how much philosophy you could pack into the same four minutes in such a format.