Won't work. Requirements for everlasting life are too complex. After all, science has barely begun to accept the idea that there is a soul and spirit. Even if the physical body has been kept alive forever, will the
connection between it and the soul/spirit always remain, as well? We are far from understanding things like this, and they may not even be something we can understand.
Besides, when the
connections are weakened, there are evil spirits that want to get in and take over both body and soul, right?

They might try to keep thier bodies immortal but it would be difficult to keep the brain and soul alive. Each time science try to make advancement that would make them equal with God, they keep on facing some unsurmountable obstacles that points them to the fact that there is a Creator.
One of the advantages of this quest for immortality is that it would advance the frontier of the scientific and health field because these billionaires would invest money to fund researches. And these discoveries would not only benefit them, but the common men on the streets would also benefit from it. I don't think anyone would achive the feat of unveiling the mystery of life and death.