Aside from the occasional Ted Turner bombshell, the Gateses seem to have just about guaranteed themselves the top slot on The Slate 60 for the rest of their lives, even if they never give another nickel away.
The Gates family, even if they never give any money again, appears to have gotten a permanent top slot on The Slate 60; the only thing that could upset this would be another Ted Turner upset.
The Gateses have never appeared on The Slate 60, probably because of the extreme philanthropist Ted Turner maintaining the top slot for decades.