So, I know there's a lot of discussion about people who do and don't want new classes, what potential class it could be and everything, but it does beg the question, what happens when that class gets to Legion. I mean, the first and obvious issue is the fact that all other classes had Artifact Weapons at this time so there's really no weapons to get while leveling during Legion. For those with Heirloom gear that's fine, but what about those without. They just have to go 10 levels without a weapon upgrade? Next is well, obviously Legion was very class story heavy. Each class had their own class hall. I highly doubt Blizzard would want to create an entire storyline/class hall/artifact weapon just to add a new class, but then how do they fit in there?
Now, obviously all of this they could kinda just glaze over by making any new classes higher level than Legion (meaning they'd have to start/leave their hero starting zone at least level 110) but I always kinda preferred classes starting at 1 and leveling all the way up instead of starting 90% of the way to max. Also being able to actually have the class instead of like with DK and DH where you could only make one after hitting a certain level (which I understand why since they started at a higher level)