So, in order to counter this kind of thinking, there could be a devaluate design, say if you hold a BTC for more than 3 month, it will disappear
So, every 2.9 months transfer your coins from desktop to laptop.
You can't really prove someone isn't 'holding': No matter how many transactions are involved, all the addresses might belong to the same person.
That's a good point, and that is also true for USD, as long as much of the USD is put into speculation, FEB must keep printing more money.