What will happen to Bitcoin in the future after all 21 million BTC have been mined?

Hello everyone, the maximum supply of Bitcoin is 21 million, and it is expected that the last BTC will be mined around 2140.
When all BTC is mined out, mining rewards will no longer exist, and the entire Bitcoin network will face collapse? What will happen to Bitcoin in the future?
How will the internet operate in 100 years? What kind of situation will miners, users, and investors face?
Let’s just chat casually today.

Fewer and fewer mining rewards
The issuance mechanism of Bitcoin follows the “halving” rule: every 210000 blocks (approximately four years), the block reward will be halved.
In 2009, when creating blocks, miners could receive 50 BTC for each block they packaged. After about four years, the rewards would gradually decrease to 25, 12.5, 6.25… The current new block reward is 3.125 BTC.
The continuously halving reward rule is designed to fit the initial set of 21 million BTC, which can both prolong the entire mining reward cycle and gradually reduce the supply relatively smoothly.
21 million pieces, then what?
After all 21 million coins are mined, will miners continue to mine without new block rewards?
The answer is: yes, but it will depend on the transaction fee market.
At present, for every transaction on the chain, a certain fee needs to be paid to the miner as a reward for helping you keep track of the transaction.
On early BTC forums, some netizens asked why my new block reward was not 50 BTC, but 50.44. Where did these 0.44 come from?
This is Satoshi Nakamoto’s answer, which roughly means that a small transaction fee will be charged for large transactions. The node (miner) that packages the transaction will receive this fee.
As block rewards gradually decrease, the proportion of transaction fees in miners’ income will become higher and higher. In 2010, he predicted that in 20 years, around 2030, transaction fees would become the only source of income for miners. At that time, there may be a large number of transactions every day, or there may be no transactions at all.

This means:
Only when Bitcoin is still widely used and there are a large number of users using and transferring money, and users are willing to pay fees for the transfer, can miners also receive reasonable compensation based on the transfer fees.
Only miners who are profitable have the motivation to maintain their computing power. The maintenance of computing power by a large number of miners is the foundation of the existence of the Bitcoin network.
Prosperity or Destruction
There are only 5 years left until the predicted “prosperity or destruction” 20 years later.
In the past five years, the world has undergone earth shaking changes. Standing in 2020, I couldn’t imagine that BTC would have an ETF, and I also didn’t expect that various regions would launch stablecoin laws so efficiently.
Five years ago, I couldn’t imagine what 2025 would look like, just like standing in the present moment, I couldn’t imagine where the world would go in 2030.
In the rounds of price increases and decreases, I constantly see myself clearly, and I can only hold onto what I believe in. But whether what I believe is what the public believes, and whether what I believe is true, no one knows.
But it’s okay, wait and see, wait another five years, soon.
I hope you will still enjoy reading what I write in five years. Goodbye!