The U.S. Mint is trying to be all things to all people, and flooding the market with so many types of commemoratives that the average collector is at a loss to complete a collection of them. I acknowledge that some of the subjects are very historically significant (e.g. H. Tubman) but most folks have limited funds and would be quite happy to just acquire one coin instead of the H.T. series of three.
I also think it is time to get rid of the cent. Nobody even picks them