Seems like a novel approach, but I'm really ambivalent about layering yet another token into the game economy in order to fix the shortcomings of the existing tokens. And like with previous solutions, you won't know the third order effects until it's too late.

The overall goal of such a system is to incentivize players to burn DEC and/or VOUCHERs in the short term in order to gain a discount on future features.

If you want to burn DEC and vouchers for a discount, why not have a mechanism that sends them to null as the purchase is made? That seems pretty simple. The dials and knobs of the game economy are rapidly becoming more complicated than the game itself, which is kind of sad in a way.

If this game had real organic growth, there would be no need for these sort of proposals. But here we are taking it to the next level.

I'll be voting no. Please continue to build a great (actual) game, and quit with these moves that just ooze desperation.