That's a cool quote, but I think the reality of the situation is that as technology gives us more control of our personal appearance looks move from an explicit status indicator to more of a fashion choice.
Vain people will definitely still exist, but excess weight or baldness will be probably be a conscious presentation choice and social signal, rather than a marker of genetics or dietary habits.
In this environment it would be incorrect to say "no one will care", but hopefully people will care less and less as they age out of that period of their life in which self expression and fashion choices tend to have gratuitous importance based on our insecurities of youth.
I imagine your assessment to be more realistic, and the quote to be far too optimistic, even though I wish for the opposite.
I know women have an entirely different level of pressure in this arena and the idea of not wearing makeup or being fashionable enough has a larger impact on them socially...as a man I recognize the differences...but have still never cared about such things and not wanted to invest myself in those who would judge me or someone else because of shallow things. I will, as I mentioned in another comment, be respectful when it matters, and not say go to a funeral in pajamas and unkempt, as to not make it about me. But in my daily life I leave vanity at the mirror. My behavior defines me to anyone I care about and theirs to me, not looks or trends.
Vain people will definitely still exist, but excess weight or baldness will be probably be a conscious presentation choice and social signal, rather than a marker of genetics or dietary habits.
In this environment it would be incorrect to say "no one will care", but hopefully people will care less and less as they age out of that period of their life in which self expression and fashion choices tend to have gratuitous importance based on our insecurities of youth.