Did you really mean to say something this completely stupid? Warcraft has literally every aspect of high fantasy. Claiming it's a different genre because it mixed in some trivial examples years back won't convince millions of subscribers otherwise. Players expect high fantasy tropes. Blizzard won't be replacing wizards with copper-toned electric cannons -- uh, sorry, "anbaric?"... whatever pretend word steampunk cosplay people use, sorry, the Golden Compass sequels sucked so much that I blocked them from my memory.
And how did that work out for overall subscribers?
Brewmasters aren't popular. Monks aren't popular. At one point in WOTLK, >20% of active characters were Death Knights. At no point in MoP were Monks even above the class average. For a new class, that's a pretty pathetic track record, eh?
Now, Tinkers are in less demand than Monks ever were.
So, why do you think they're a good idea?
(This is really the fundamental problem with TinkerTards: they're all zealots who ignore all evidence they find inconvenient, no matter how plainly obvious. At best they try to shout reality down by screeching louder. No one wants tinkers except 6 or 7 people who simply cannot shut up about it. They all have Tinker Tourette's. Simply put, tinkers are a terrible idea that will never be popular and Monks are exactly the example that prove it.)
The only reason modern battegrounds aren't full of Engineers is that Blizzard shut off all the belt enchants in Crapaclysm. Most progression raid guilds are still majority Engineers. We're 11/14 H and 6 people in our 10 man crew have Engineering.