1) Put promo boxes on auction house featured. Place rare boxes in single units with bids only, while the common/less sought boxes go for buy out prices. Starting prices can be adjusted by hand to sway the cr sink size.
2) Re-enable super brawl to bring back some pvp-ers at least temporarily. Maybe make it a temporary event if it's that broken.
3) Make a new achievement hat for tf2. You'll easily get thousands of people average again. I wish I knew the logistics of getting valve to agree to this though.
4) login rewards, specifically of the kind that may validate people playing prestige missions.
5a) Revert the October 2013 nerf of radiant crystal drops.
5b) Make forge passes exist. It's silly heat amps exist, but not forge passes/amps.
I was thinking that if CE was going to be a necessity for Gray Havens, I think they should give more reasons to ultimately use CE. In the supply depot, promo boxes can be added permanently of any kind so players can get costumes anytime they want. Have players be able to change the color of gear in their own way and where, including costumes. Also, what is Super Brawl? is it the old pvp where no stupid striker pack ruled all of coliseum?