They already named the Mars Pathfinder station after him
Which of course was immediately ignored after the dedication.
They will name a prominent crater on Mars after Sagan, I am sure.
He deserves the accolades, but I also think others who also toiled on
wresting secrets from Mars deserve some attention, too.
How about this fellow, Eugène Michael Antoniadi, who made excellent
observations of the Red Planet which were good enough for him to
realize that the infamous canals were optical illusions.
http://www.daviddarling.info/encyclopedia/A/Antoniadi.html
He would also have that international flavor that The Planetary Society
is pushing for NASA to do as well.