a theoretical series of transactions which move 100% of the existing bitcoin to some previously-unknown wallet address would reduce the BTCDD figure to 0%
You meant "increase the BTCDD to 100%". Your previous post in this thread was correct in this regard.
Even if you consider that there are lost coins, the theoretical BTCDD figure approaches zero as the number of days goes to infinity.
If there are lost coins and a finite total number of coins then the BTCDD percentage cannot possibly reach 100% ever.
If there are no more transactions then the BTCDD tends to 0%.
In the long run, if there are any transactions then the BTCDD has a lower bound given by the proportion of the transacted coins out of the total coins.
Arithmetically it seems to me that the percentage cannot exceed 50%: in fact it should reach 50% asymptotically.
Both statements are incorrect.
ByteCoin