Silicon Valley billionaires have proved repeatedly that they are nothing more than overgrown teenagers. I hope that they do achieve interstellar colonization. This planet will be better without them.
As far as I know, of the five panellists only Musk is a billionaire - the rest are researchers/academics (Nate Soares is an edge case, but still, as the executive director of MIRI, I doubt he's rolling in cash - the whole organization has less than $2M/y in revenue).