Popular 2-term presidents helping to clear the field of serious threats for a chosen successor is normal behavior. Bill Clinton did it, Reagan did it, Obama did it. W. did not, because he both deliberately did not have one and because he was political poison at the time.This isn't any candidate, this is Hillary Clinton, the person who managed to crowd out every potential challenger against her in the 2016 primary before it even begun. How often has that happened in US politics history?
The Clintons retain a lot of allies in the DNC and congrsssional leadership, and donors. These are very old and very loyal friends, and Loyalty is the number 1 thing Hillary Clinton cares about.
How many serious criticisms have we heard towards Hillary and those allies from the Democratic party after Trump won? They couldn't even replace Pelosi.
I can't imagine Clinton 2020 will have the same dominating position over the party as she had in 2016 and is outlined in 'Shattered'. But those friends aren't going away, and there's an argument that she can make.
Why would we replace an incredibly competent House leader who has taken the GOP to the cleaners twice on Continuing Resolutions since being re-elected to the position?