I disagree with those who say that transactions fees will be enough to incentivize miners to keep mining.

Even if 1 bitcoin will be worth millions of dollars, users will always pay cents for transactions fees and because the number of transactions that can be contained in a block is limited, fees will not be enough to cover miners expenses.

You don't know that fees won't be enough to incentivize miners because you don't know what the fees will be. You are making a big assumption.

Besides, Bitcoin is designed to always be profitable for at least some miners through the difficulty mechanism and the economics of mining.

I don't understand why it would be in anyone's interest if it never happened, and who these people really are? But if anyone wants it, they will have more than 100 years to make sure it never happens.

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It is not logical to compare the current state of technology with that which will be realized in the next 20 or 50 years. It is certain that the efficiency of the mining equipment will increase and that the price of electricity will go down. I am thinking, above all, of renewable energy sources such as the sun, wind, the power of water (rivers and seas), which will increasingly become the standard everywhere in the world. If the price of BTC goes up and costs go down, mining with all its safeguards will continue to be profitable.

It’s rather strange to hear a question of this type from a person with the rank of “Legendary”, but in theory, because we certainly won’t survive by 2140, miners will receive an award only from transaction processing. Because the Bitcoin limit will be exhausted.

Lets not make this problem now mate because this will take another decades
before it happens and i think there will be a
 new protocol when that time comes or new system in which the miner will still be rewarded upon using their rigs ,But you
made me also think here because this is a serious issue though i am sure i will not be facing this as the new generation or the next will need to answer this.

By that time it won't matter, BTC will be worthless replaced by privacy coins.

For now you should enjoy what you have and make use of the opportunities that are given to you. The last Bitcoin will be mined around 2140, and that's still over a hundred years to come. I believe that when that time comes the Bitcoin team will do whatever possible to put the community in a better position. They wouldn't like to do anything that is going to ruin everything that we have been fighting for all these years. They might possibly change the protocol if things are not going the right direction.

But, I read somewhere like when bitcoin mining reward reaches zero, the transaction fee will be summing up more than 50 bitcoins as mining reward per block generation. So, miners will never face losses. So, they may not lose interest in securing bitcoin network. But, it will happen only after another 150+ years hence we do not need to worry on this as of now.

FrI’m the information i got I don’t think bitcoin mining is ending even in a hundred years to come and if eventually it happens bitcoin miners will be paid transactions fee. A couple of times I have asked myself these same question but get to realize bitcoin is just a digitized technology and can easily be flexible. We shouldn’t think of all bitcoin being mined apparently 120 years from now all of us will be gone.

Only one or two pools will become profitable, The rest will go out of business.
Currently only 15% of the rewards is fee rewards. 85% is block rewards.

Two pools, will turn into one, one of them will start mining at a loss and not be able to afford the hydro.
Then it becomes centralized.

Here is a simulation of it.
https://www.youtube.com/watch?v=czUU3Z8spUQ

It will be a central banker with the biggest bitcoin mining farm and he will collect all coins through network fees AKA enforced tax and enslave your future offspring again.

I am also curious about it especially to the miners if what will happen to them but in the other side, I can see a good effect also if the bitcoin will be completely mined like the bitcoin price will continue to increase especially the users of bitcoin will continue to grow as the supply has been limited while the demand continous to grow.

These are the advantages that I saw once the bitcoin will be mined completely but with regards to miners, I am still puzzled if what will be the disadvantages to them once it will happen in the future.