If you could, would you live forever?

For a healthy evolving race, the weak must die. That's not happening here, so unless humanity finds a way to discourage the "weaker" to reproduce, WE will be the more intelligent people after, say, five thousand years.

That argument really doesn't hold water based on IQ scores of the past several years (IQ is a flawed metric, but the fact that scores are going up certainly implies that things aren't being entirely fucked). Not to mention that morality and knowledge is ever-evolving and the 200-year-old brain you just mentioned will be a lot more resistant to change and gaining new information. Eventually your knowledge and opinions are going to be outdated simply by virtue of the fact that you can't keep up.

As for the "follow most developments in society and adjust" thing, most people who are eighty, let alone two hundred, are kind of shitty at that. I do think a fair portion of this community is liberal and open-minded but I feel like it's a lot more complex than you make it out to be.

Also that argument's kind of eugenics-y and creepy.

(It is total sour-grapes bullshit that death is the only way for life to have meaning though)