Oh Stryder seeing my name emboldened like that made me go all squiffy.
I could of gone with some bright coloured font, but I thought that may misconstrued that I'm insinuating something rather than actually have a real discussion with someone.
It may be a specialist subject as can any if you go into enough detail but here the OP is considering the implications of the subject becoming a reality. Technologies often evolve way beyond the scope of the original concepts.
Now, don't get me wrong, I'll be first in line when they bring out the cream that will upgrade my memory when I rub it on my temples. I might even consider having the brain implant offering instant recall of the entire catalogue of the British Library but I would like to see a list of the contra-indications beforehand you know?
This is the obvious need for prototyping and testing which as you well know could take decades to achieve decent results. (That's the problem with things like Medicine, companies that produce pills want to see a return on their funding so their testing is sometimes not as thorough as it should be because the quest for return outweighs the "potential" abnormal reactions that occur. This is proven in a number of cases, where companies "Bean count" to fork out settlements for those that have problems related to a drug course, but only after they've made millions, potentially billions in revenue.)
And all this improving and curing. Will it eventually make humans invincible? The planet is bursting at the seams with us as it is!
I wouldn't say we'd be invincible, imagine if you will playing a RPG online. To begin with you will be "Squishy" which basically means you can only handle enemy that's lower in stats to yourself, or you just basically squish, However during your game you can slowly start to "upgrade" your weapons and armour to lessen your squishiness.
I'm suggesting there are potentially stages of "upgrading", which stem from just Interfaces, to Cybernetics and perhaps beyond. (Transhumanist Ascension where a persons life when forfeit [e.g. you die] is then continued within the confines of a machine world, a Virtual Reality. Obviously it sounds far fetched, but it's all about whether people want to achieve it or not.)
Obviously we are probably best resurrecting further discussion in another thread since the OP's pretty much stated they are discussing the implications of true AI possibilities. To be perfectly honest, I don't think there could ever be a true AI because us humans have a nasty habit of writing code which softens the strongest of AI's.