I think the rule of law will prevail for the most part, and private security will make up the gaps. Whether this is just or injust is left for the reader to ponder but I don't think radical life extension for the rich will prompt revolution.
by sane metrics the person who makes $60k a year is fabulously wealthy.
But what can we do? Is not the solution to raise the tide for all, rather than scuttle our own ships? There is no reason our planet, properly ordered, cannot provide all its inhabitants a comfortable, dignified, even prosperous stay.
Would that I live to see it happen. Everything good comes from the middle classes. Multiply them and you multiply everything - technology, culture, progress. Expanding the middle class should be the goal of any technocrat with an eye to the future. Helping the poor isn't just altruism, it's self-interest too because while they suffer we cannot conspicuously splash money around on more useful things.
Think about it. It takes time and money to commoditize any new technology; wealthy early adopters are often required to help the technology evolve to the point where it's ready for the masses. Remember when only the "rich" had phones in their cars? And the way ordinary people would often snicker at the very idea of such an indulgence?
Now imagine a time in which only the "rich" can live forever. Suddenly there's not so much snickering, as there is the sound of axes being sharpened.