It's amazing how unaware so many Americans are about just how right-wing their country is. HRC is only going to go enough to the left to capture the Sanders voters whose faculties of observation and reasoning function to a minimal degree. She must steer a fairly centrist course in a country where Christian religious terrorism has successfully debased or eliminated healthcare rights for women in a great many states. Denmark or even France this country is not. 
Clinton will be able to co-opt most of Sanders' ideas and make them palatable to a country still dominated by conservative (populist) thinking. 
It's easy to write passionate letters with fiery metaphors, it's more difficult to inform the sound byte generation about the importance of issues such as voting in mid-term elections, gerrymandering and the last 35 years of American history. Hillary is no worse than Obama, just less melanin and female reproductive organs. Most of what Sanders claims he would do wouldn't happen anyway.