They should add new school years to what they already have. How will a sequel work now we have all explored every inch of Hogwarts, and lets face it the best thing about this game was Hogwarts and Hogsmeade. One of my favourite games I've played, cant wait for more
HL has it's problems but its a very nice first try and they nailed the magical feeling.
I would like them to build on top of HL. There is so much potential in that universe and i hope they establish the franchise Legacy franchise.