*actual* Mario games, still, aren't that common. Sure, we get Mario-skinned games like Mario Tennis and Mario Party, but an actual Mario platformer (2D or 3D) isn't something we tend to get more than once a year.
Hell, it took nearly 20 years to get an original, new Mario 2D Platformer... And now, because we're getting a few more (mind you, a new game for new systems... not even a same-system "upgrade"), well... Mario's played out.