Flask costs will remain high I think. So they will maintain a pretty steady pressure on herb prices. Also, since Starlight Rose is basically a bottle neck, I would expect that price will remain quite high.

Right now, as a solo character, I can farm up 300-400 Farnskaggil an hour, and for anyone who runs around stormheim, they are aware of the rampant teleport hacking herbing bots running around. Farnskaggil is dropping in price, but it still fetches 50-80 gold per on my server.

I would expect Foxflower will remain more expensive due to the general crappiness of Highmountain for moving around.

Once flying mounts come in, I would expect all herbs but starlight rose to tank in price, but since Starlight rose remains one per pick, and only a 100% drop chance if you have Starlight Rose 3, I think that cost will stay high.

The ores were going to tank once the people looking to upgrade crafted gear filled their need.