Myelination in cephalopods
I am a complete amateur regarding biology, so please forgive me if this question is a little stupid. Could we ever create squids that have human-level intelligence and could serve as a replacement in case humans die out? I heard that squids can have giant axons, that can exceed 1mm in diameter. However, they do not have myelin coating. What would happen, if we would give their cells myelin coating (by gene editing)? The signal speed in the axon seems to be related to intelligence, but the large axons already compensate for the lack of myelin, so would myelin coating even change anything?
I have no background in biology and recently became fascinated by cephalopods. I would appreciate it very much if anybody with a little more knowledge of the subject could answer these questions. Thank you very much for your time.
Edit: I ask this question here and not on the biology board, because I was told that more "speculative" questions belong on this forum.