I doubt that transhumanism will be that appealing to those in the know.

I'm a bit more concerned about the elite trying to chip the populace, or some method of cyborg enslavement.
Who knows what that leads to, and any (and all) aspects are horrific.

I think that the elites will be concerned that others could somehow influence them through whatever attachments.
Also, foreign bodies are prone to infection etc. Most who have implantables make the decision based on survival.
Adding anything connected to the brain creates another set of risks that far outweigh the short term benefits. Particularly, if some life-extending treatment is developed.
In this scenario, is better to wait for the technology to fully mature.
This may change in +100 years. But it might not.

I'd definitely go for reasonably developed life-extension treatment.

I'm not down with any infected when I'm 70 cyborg brain implants.