- Do you think all dormant wallet (long inactive wallets) are gone forever?
Of course not. There have been wallets that's been around for a decade then suddenly became active.
- As we are not certain of Satoshi's return, should we be bothered about his dormant wallets?
No. Because it's his money. He should do whatever he wants with it.
- do you think lost Bitcoin can cause Bitcoin scarcity in the future?
Even dormant wallets already sort of provide some 'scarcity' due to the fact that they're off the markets.
- From a total of 21million total supply, can you attempt a prediction guess of the total number of Bitcoin that would be in active wallets after all Bitcoin has been mined?
Around 500k lost probably. Just a random guess.