Guys correct me if I am wrong, somebody ask me a question about what will happen to bitcoin miners after all available bitcoin have been mined and no more halving every four years, will miners go out of business? This is the question I was asked and I believe that miners are the reason why transactions are been processed, right? correct me if I am wrong though, I believe that even after all the 21 million coins are mined, Bitcoin miners will still be here because they are the reason why transactions are going through or am I wrong?
Sure, miners will still be there, blocks need to be found for the transactions to be confirmed. Otherwise, transactions would be stucked in the mempool forever.
But I think it is not going to happen before the year 2136 (or 2140, not sure of the exact date)
After this date, as IIrik11 said, they will no longer receive block rewards, but only transaction fees. The fees are not negligible for the miners, even if the price doesn't go up much more. It's more the adoption and usage of the blockchain that counts, recently we saw blocks with a reward (block reward + fees) that went from 8 to 11 BTC. Huge reward per block, even with fees only. Imagine the same reward with a BTC at 60 or 100k
However, the real question is, will BTC still be needed and useful in 2140? And for the time being, I don't think anyone will be able to answer that question with any guarantee.