I think I started the expansion in the 4000- 6000 gold range and bought 20 packs at the start of the season. I got the mini set, Khadgar, Magni, and purchase arena maybe 1-4 times per week, but don't buy any packs other than 20 max at the start of the season (I'm a Wild player.) Currently in the upper 5000s gold. Now that I have all the skins I want, I expect to net a couple thousand more gold in future seasons. However, I'm not quite as disciplined when it comes to saving up dust because I rely less on packs and more from dust to craft the decks I want, especially when it comes to cards rotated out of standard.
My plan is to maintain this strategy until I get close to the gold cap and don't have enough time to play arena, after which I will start purchasing packs. If I get to the point where my collection is full, I will begrudgingly start purchasing card backs!