I don't like the idea of vouchers either. It would be a terrible idea to add them now if we didn't have them but we do and so many promises were made using them. So I think there are better ways to address this.
Vouchers did not end the bull run. The general market conditions in addition to a massive overprinting of CL packs combined with misuse of funds from that sale is what ended the Splinterlands bull run.
I do think we remove vouchers from pack discounts, energy or anything else that competes with dec but i think we need a new utility for them.