Hillary will get the blame for 2016, but her supporters will be forgiven. The Democratic Party will implode if they're not.
Honestly, outside of this forum, I've seen very little blame given to Hillary for the defeat, and my social circle is probably a majority of Sanders supporters (with most Republicans in it being anti-Trump through the very end). Blame is given partially to James Comey, but mostly to the unfair system that took victory away from the popular vote winner. Anybody who saw Hillary favorably during the general-election campaign still sees her favorably.
Nobody would give a sh**t whether someone endorsed Hillary or Bernie four years back, especially the vast majority of Bernie supporters who voted for Hillary themselves in the general election.