While that's a noble sentiment, there's a reason they went that route - you simply run out of content to go through with powerful enough iteration. You can't squeeze out 10 expansions and continuously up the stakes while within the confines of a (narratively speaking) small setting like Azeroth. Otherwise you quickly run into problems of ridiculousness, like where was big bad character XYZ during event ABC and so on. It's what the MCU is struggling with at the moment in movies.
Me personally, I echo everyone's call to erase the alternate timeline bullshit. If they wanted to go back to Draenor they should have made Outland 2.0, revamped old TBC content to not be horrendous (similar to Cata's old world facelift) and come up with some storyline there. Also the Burning Legion was handled terribly; while Legion on the whole was a good expansion, it never did justice to the cosmic scale the BL supposedly operated under and turned THE biggest villain in the entire WoW lore universe into mostly a throwaway joke that was simply ex-machina'd away.