Without going in to spoilers, the recent season of the Revolutions podcast about a future fictional revolution on Mars touches on this a fair bit. Someone about to die seizes power for himself, but no one cares much because he was already in charge and extending his reign a few more years till he dies was no big deal, until he extends his life and lives another 75 years.
"Putin Eternal", or something like that. Ironically, the technology will probably lead to faster, worse fates for many like that than might have been the case if they'd just left it alone.
