That is completely unrealistic and impossible. They've never been immortal before, and they won't be until the end of time. It's undeniable that they'll have a lot of money to change and modernize the world to their liking, but I believe nothing lasts forever, and whatever they've created or changed will one day cease to exist. It's past time for people to realize that this world is just a passing fad; do what you can to achieve your goals and leave the world for the next generation to take over, and stop fantasizing about living here eternally.