I think it's brilliant and could be done fairly quickly. at least it could be a start.
That's the system the Zeitcoin devs implemented yesterday. The price has since doubled. Though to be fair, it did double from extremely low levels.
It seems to be a good system to create demand.
I don't know how it's going to play out for HBN, but it is extremely hard to mine this coin, so this could help people that want to mine their way in at much bigger scale since the supply comes from the market. Plus it's could create a nicer liquidity those PoS block looking to be sold.