But I keep hearing a lot of gamers/Nintendo fans saying they were wish Nintendo would step away from Mario for a bit for different stuff. Granted I am unsure what Nintendo fans want since some say they want more grown up games like PS and Xbox and than some say those would pollute Nintendo's name. If we do get a Mario in 2016/2017 I would be ok with it. I'm not saying no Mario.
They don't have to stop developing their staple franchises to have some variety. They have development teams who can work on the Mario/Zelda games, and have other teams working on other things. We've had 3D World and we're getting Zelda U this year, as well as a good variety of things such as Fire Emblem x Shin Megami Tensei, Bayonetta 2, The Wonderful 101, Donkey Kong Country, Xenoblade and a new Starfox.
As for more mature games 'polluting' Nintendo's name.. I don't think Nintendo games can be summed up as a whole like that. Sure, you have the happy colourful sunshine and rainbow games, like Mario, Kirby etc, but there are also things like Metroid which are a little more on the mature side. It's evident that Nintendo are a little more reluctant to have 18-rated games on their systems, but Nintendo games as a whole cover a vast range of genres and age range targets, even if they do try to appeal to people of all ages.