what if the block reward goes to 0, the tx fee cannot support such high hashrate

[macson]

Of course the block reward will be zero because of the halving cycle that occurs every 4 years, so the block reward will continue to decrease until it finally reaches zero around 2140. And it took more than 10 years to achieve that, and I don't think that all of us here will live long enough to see the event happen. So practically it's not an immediate concern to discuss right now.

But even so, though the block reward will decrease, the price of bitcoin will increase, it will compensate for the reduced block reward in terms of value, so that mining remains profitable and sustainable for miners.

And even when it becomes zero in 2140, miners will still get rewards from transaction fees and thus the bitcoin network will remain safe and secure because miners still have a strong economic incentive to continue validating transactions and secure blockchain through proof of work.

[Cryptomultiplier]

I think such a scenario you painted would mean that the layer-1 is no more sufficient and thus can't allow for more growth of the security budget which stands to protect and stabilize the network.

It would also mean that a layer-2 scaling would be adopted so that the entire security budget which includes and depends on miners rewards being substantial enough from their input, will from subsidy and fees continue to grow to maintain a high hashrate.

[Faisal2202]

There is a serious bitcoin security problem one the road.

What if the block reward shrink to low after ten years, but transaction fee is still as low as now?

Miners cannot keep such high hashrate because of low total reward. But the AI calculating power is growing fast.

IF bitcoin network difficulty collapse, it would be very easy to do 51% attack by.

Therefore, something must be done...

The reward for the miners can be low, but due to the difficulty and hash rate, their resource consumption and expenses are going to be increased so if, according to the 10-year concept discussed above by other members, and the reward of 0.3+ bitcoin is the block reward, which to be honest, is very low.

But this can mean the adoption for other types of networks like LN etc. and if someone is still not using them they must because familiarizing with it can help us later (the users).

But I think as a simple users, not a miner, I would shift my resources to other tokens if the chances of making money will be reduced as the solo miners are even making money randomly but they are then 0.3+ block reward can move the market too.

[el kaka22]

The newbie questions are always welcome, but first of all it should be in the newbie section, and secondly this can be found very easily anyways. First of all people are right that it will not go to zero anytime soon, it will take decades before it gets there.

Secondly and most importantly, the price is the one that drives this forward, which means that if we are still profiting from mining after it got down this much, that means we are going to see the same with zero too. Think about it, it was 50 bitcoins per block when it started, and yet we are at nearly 10% of that and still profiting, why? Because of the price, so if the price of bitcoin continues to go up, it can still be profitable for miners even if reward was zero and they only get money from tx fee.