"The prices on Lamannia are not final," Senior Producer Erik Boyer wrote. "Inspired by the Lamannia feedback, the Heroic Heart of Wood will be greatly reduced from the price displayed in the bartershop today. We'll be looking at your additional feedback and how players play through sagas, and adjust the costs appropriately. We expect the average player to, upon reaching the minimum level requirement, spend additional hours to obtain a Heart of Wood –- but never hundreds of hours.
Boyer also said that the Twelve barter NPC will continue to sell Hearts of Wood in Issue 20. Players who were upset at the original changes to the acquisition of the item have been staging an "Occupy Stormreach" protest on one of the city's bridges.
[Thanks to Robert for the tip!]