Why on earth ask for a Gandalf when no Boromir has been made?
There is a long list of deserving characters, but remember they want to make money too. A Boromir may sell ok for hardcore fans, but not nearly as well as a Saruman or any of the "baddies". I honestly don't know if they even plan to continue the line past him(or finish the other line), but I hope they do. I really want to see a Balrog Maquette at least the size of Sauron, if they give me that I don't care what else they make, I will be happy.