why would we need a mage when we have enchanting???
Tinker is a well-established class in WoW Lore... and they have been there longer than the -Pandaren- race (which was merely a -fun- hero in WC3 .), yet we've seen Blizzard making a whole expansion based on Pandaren.
Tinkers need some love. all 11 WoW classes are based on "magic" and "brute strength", we need a class that focuses on "technology and knowledge".