The boom might be over but we still have 1 more herb source. Also, during the boom, people might have discover their Rank 3 Herb / Potion / Flask reducing the amount of node you need.
Price will go up, sure but certainly nope as high as it was.
Also, I'm the only one using Pot / Flask on all fight I can (progress or farm). Faster kill make faster raid... The argument of the new raid is weird.