It's sad to imagine a day when Peter Thiel, Donald Trump, the Koch brothers, Fidel Castro can live forever. Even non-evil billionaires like Bill Gates living forever could be tragic, in that it greatly reduces the motivation for significant philanthropy.
Well, at least we don't have to worry about Fidel anymore unless it somehow becomes retroactive.
Immortal of course doesn't mean impervious. A long, unaged, productive life span would still require food, water, shelter, and some amount of safety.
One of the most common (and usually loudest) arguments I hear against general species-wide immortality is the resource limitations of Earth. Well, if we can live for a thousand years or ten thousand years, what's the purpose of not traveling interstellar distances? The major limits are mostly the lifespan and related issues after all. The rest is mostly engineering. We're good at engineering our surroundings.
If anything, once you've cheated death amassing more personal power might feel like a bit of a waste of time. Waste of time probably isn't the right phrase but you get my drift.