I know you meant your comment as sarcasm, but to do it, you need to have a legacy worth those kind of numbers to begin with, instead of selling your labor as most of us here do. It's not so different that celebrities associating themselves with brands through advertising.
And as distasteful as it seems to many of us, people like her spend years building their social networks and a reputation for various personality and behavioral traits in a boardroom.
Also, I doubt her legacy is closed at this point. The traditional next step would be to write a book based on her career capped off by her experiences at Twitter.
Lots of corporate boards, university boards, nonprofit boards, etc. make room for folks like her. She understands something about social media and the digital future -- and even if that expertise doesn't impress many folks on HackerNews, it will seem quite sufficient and robust to the elderly trustees and big-donor board members of Pleurisy State University.
Being 62 is the perfect age for such roles. Young enough to climb a flight of stairs; old enough to nod appropriately to her new peers' references from the 1980s. Executive search firms will be eager to guide her into as many board roles as she might want.
Which given the nature of democracy are many of the same as the people who elected the last one and the one before, etc. Are we not all snowflake-unique kinds of stupid?
My point of gratitude for today is that my level of stupid is not nearly as consequential to others as some folks'.
Where can I sell my legacy for $6 million/year?