if we really recycle those 10-year-old unmoved bitcoin into new mining rewards, then all of Satoshi's addresses will be emptied too! This could possibly boost up the confidence of investors/holders, as the fear of Satoshi dumping his/her bitcoin will vanish.
Just playing devil's advocate here.
TL;DR: The idea of "recycling" unused Bitcoins is intriguing.
Unfortunately, it is most likely unusable any time soon.1. satoshi's stack is a ticking time bombWe're using a currency where at least 5% (probably much much more) of the supply are in the hands of a handful of unknown entities.
They could, at any time, drop their stash on the markets and crash the exchange rate, thus destroying the wealth of thousands, if not millions of HODLers.
No prudent person, responsible for the wealth of others, e.g. a pension fund manager or a secretary of the treasury should even think about storing a significant share of his funds in Bitcoin, as long as the time bomb is active.
No prudent politician should advocate the widespread use of Bitcoin for fiscal matters.
Thought experiment: let's assume I'm an advisor to POTUS and he asks me "should we stop using the Dollar and use Bitcoin instead?", my unequivocal answer would have to be "no Sir, Satoshi could be the Chinese or the Russians, and once we're at war with them, they'll destroy our economy".
Destroying the stash could defuse the time bomb.
2. diminishing block rewards might become a problemThe general consensus when it comes to ever decreasing block rewards seems to be that "transaction fees will cover that".
But the truth of the matter is: we don't know.
Transaction fees are a special case of "tragedy of the commons" where higher fees might be in the interest of everyone, but each and every single one's interest lies with low or zero fees.
This situation is prone to abuse.
Political entities might take over from economically driven miners, concentrating mining power in the hands of states rather than individuals, offering low or zero fees in return.
A situation with an overwhelming percentage of mining power in the hands of states is ripe for censorship (if not worse).
Even the build-up of "51%-first-strike-capabilities" in an arms race of deterrence in the age of cyber-warfare is not an unthinkable scenario.
Recycling "unused" coins into new block rewards might defuse that situation, by incentivizing private miners.
CaveatsRecycling "unused" coins into new block rewards is a "good idea", but most likely unwanted by the community.
I actually expect basically zero support.
Even if consensus could be reached about recycling, finding a workable, agreeable threshold for the time after which coins may be safely regarded as unused would have to be highly conservative.
Let's assume we could agree on recycling 100-year-old coins.
That would not solve the "satoshi time bomb" for another 90 years, but still leave us with possible "state-miners" within the next 50 years or so.
ConclusionNothing gained for another 90 years, but a whole new era of "blockchain wars" on an even greater scale than with the block size-debate?
No thanks.