Than trade it away with a new heirloom trading system, because a heirloom reset also means a heirloom theft.
1. I dont know how the trading system will work. Let us assume I can exchange a heirloomed weapon with another player. I cannot be sure that another player will exchange his weapon with my weapon. Imho the main problem is the weapon balance. If the weapons are balanced you will have a diversity and you will be able to exchange your weapon. But than you will not have a problem with a repick. If the weapons are balanced the players will not choose the same weapon.
2. I also dont know how a reset would affect the amount of my heirlooms. Nobody knows numbers.