This is exactly one of the solutions I mentioned in a previous post on here. I asked why can't Devcoins be destroyed via a Freicoin style demurrage to cap the rate of inflation and people flamed me for it. They hated the idea of destroying Devcoins for any reason but I do think this solution has a chance to work and should be implemented robustly.
It makes no sense to have demurrage in devcoin because inflation already has similar effect.
What makes sense is destruction of fees which normally go to miners... In this case higher trade volume will make coins more valuable. You can't get same kind of behavior via demurrage.