I applaud the move. Curious that these cases stretch as far back as 1978, isn't there a statute of limitations for this sort of charge? If so, I would have expected the oldest to have been closed automatically decades ago.
From a systems point of view, I'm uncomfortable with the idea of electing prosecutors for this reason -- it might be better if they were appointed and held to basic broad metrics like violent crime rates and quality of life changes versus costs of incarceration. In fact, it might be better if there was less media attention placed on prosecutors in general, as this is often a stepping stone to other types of political office. I'd even go so far as to ban them from higher office for a period of time after their term is up. It just seems like the pursuit of justice is the last thing you want to politicize, and if it wasn't politicized, but there was an emphasis on efficiency, we would never have spent so much money on low level crimes in the first place.