I have been playing since 2005. I have never really relied on the auction house to make my gold (I don't have the time, what with me having a life and all). In fact, I hardly ever use it. But as the years went by, I've always managed to get my gold total to progressively increase with each expansion. Not so with BFA. In fact, my total has actually gone down since BFA launch. Is this normal? Yes, I have been buying items from the rep guys, but I do that with every expansion. My gold started stagnating a bit before BFA, but since launch ... wow! I guess I can kiss that dinosaur mount goodbye!
Mythic+ rewards will also go up by 30 item levels; however, during the first week of Season 2, rewards from end-of-run chests will be capped at Mythic 6 quality (item level 385), and the chest you open next week will contain Season 1 rewards if you do a Mythic+ run this week. (So, for example, if you do a Mythic 10 during the final week of Season 1, you’ll get a Season 1 item level 380 piece and 60 Residuum from your first Season 2 chest.)