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Most likely 5-6M, and the rate of losing New BTC per day very soon (30 days) will exceed the rate of newly mined Bitcoins per day.

#bitcoin will become deflationary next month.

It will enter a new phase of a greater tendency to become deflationary.

I deeply believe that LOST BTC QTY is significantly higher than 3.7M. Most likely 5-6M.

Yes, more than 5 million, and mostly they were held by the indivduals, naive users who out of ignorance lost it.