All that would change the moment she decided to run (or maybe she could delay it until she got elected). The reason she maintains her popularity is that she generally stays out of politically divisive issues and that the media doesn't demonize her if she does dabble into one.
I'm sure some people did think that. But in my experience, many more people thought they were horrible candidates that showed the Democrat party cared more about rewarding insiders than actually winning the election.
Trump is a reaction to large portions of the population being actively screwed over by decades of neoliberal policy that the Democrats are still trying to ram down their throats, and "anything other than more of that" is what is winning in most swing states. It's unfortunate the the Republican party is incapable of running someone who isn't a infantile, thin-skinned, nasty blowhard to govern responsibly while in power, but here we are, and we'll unfortunately stay here until either the Republican party grows a spine, the Democratic party figures out how to not intentionally alienate a good portion of the voting population while also preventing their base from destroying the party from within, or the whole thing blows up.