Fair enough. One benefit of playing less is that you'll spend more time playing arena, since your ratio of daily quests to time played in game will increase. Since I started doing a run every two days or so I've found it much much easier to keep the gold total going up rather than dropping rapidly.
What rank did everyone end last season at? I was 12, although I wasn't particularly close to plateauing.. I just play way more arena than constructed.
I finished at rank 3 (though I hit rank 2 twice), mostly playing 3 decks:
1. a taunt-heavy Druid, with Watchers, Sen'jin, and Mark of the Wild; and a curve topping out at 6 for Cairne, Black Knight, and Gelbin
2. a Priest with Ancient Watchers, Sen'jins, and Molten Giants to deal with aggro; and Thoughtsteal, Rag, Ysera, Mind Control to deal with control
3. a fairly standard Shaman with Pyromancer for anti-aggro, no 4-drops, Argent Commanders, and a Windfury finisher
It seems the meta-game changed a lot over the course of the season. The Shaman was good when it was a lot of mid-rangey stuff with some aggro. The Priest was good when things polarized to heavy control or heavy aggro. But by the end, when it was mostly tempo Warlock or tempo Druid, the Druid became the best.