What happens in 2140 when the last BTC was mined with the confirmations of the transactions in the blocks and thus with the block rewards. There should not be more BTC than Rewards, because 21 Mill BTC were gemined.
How are the transactions then confirmed?
well, if many peoples still use bitcoin, then bitcoin price will more spiking at that time because bitcoin circulation cannot increased anymore.
bitcoin demands can increase, but bitcoin supply cannot increase. resulting a very expensive price in coin.