This is why the game is dying lol.
Based on the spreadsheet math (it assumes you do daily heroic, 8x mythic dungeons per week, and all suramar rep + AP world quests each day) you will reach 17 mil AP roughly 77 days after Legion launches.
It will take 194 days to have one artifact that is fully unlocked 36/36 + 20/20. Getting your 2 off-specs to just 28 traits each (basically unlocking your gold traits and most relevant DPS ones) will cost you 2 million AP which is not an insignificant amount - its exactly the same that it costs you to go from 36 to 37 on one artifact which gives you your first 5% increased total damage trait.