A new Mario RPG game would be nice. M&L SSS was very good.
And I kinda lost interest in Mario Kart after the Wii version. I didn't feel that it was such a great game... Still, the DS version is good, and I still play that with my friends every once in awhile.
As for the NSMB, I was also disappointed by it's length, and the difficulty. It reminds of the good times when I played the original mario on my SNES, but that's about it.
Never really got into many of the mario sports games. Most of them are really fun, but nothing worth going crazy for. I really hated Mario basketball for the DS.
And I still think Mario party is fun.....