I don't know about that, the reason these billionaires exist is because they're at the top of the pyramid of a fucked system, if they all died overnight they'd just be replaced by the next one in line, cheap plastic shit and toxic food would still get produced, pollution would still keep happening etc. I mean there's a chance that the event might work some sense into the rest of them, or scare them into enacting actual change but it's not a given.