First of all, the idea in the bitcoin show is not new. You may be interested in this thread:
https://bitcointalk.org/index.php?topic=9295.0

As some people pointed out, demurrage would solve this problem.
The only problem with the solution proposed here is with very durable stores such as bitbills. Apart from that, no one is punished, hoarders can move their coins from one address to another from time to time.

The proposed solution is also nice for storage (demurrage also solves the problem here).

Another good side effect is that lost coins would reward miners, something that some people say is critical:
https://bitcointalk.org/index.php?topic=6284.0

Freicoin also has perpetual reward for miners. Freicoin is different from maaku's proposal because it distributes evenly the demurrage charged between miners (after the maximum monetary supply is reached, the reward for miners is constant. Well the fees are still variable), instead of some of them being luckier than others. I still don't know why he wants his system to be like that.