If I had it my way they would release 2-d versions in between the 3-d ones. New super mario showed their is a market for it.
They should revisit all of their classics in 2-d and use some beautiful artistic style and graphics that the new consoles allow for, but keep the controls the same as the classics. Maybe drop it on WiiWare or something.
A newer more beautiful Super Metroid would put me in heaven.