It's hard question and nobody can answer it 100% sure. Bitcoin is still kind of experiment.
IMO only thing what will happen is there will be less "profit seeking" miners in future, because now most of new members come with exatly same vision .... make a fortune.

Mining is essential to keep the network going. The 25 BTC with a block is called a block reward because it is what it says it is - a reward for successfully hashing the block.
Read up on the protocol documentation to find out more.

When 21M BTC are rewarded from blocks, there will be no more blocks that have a reward, but miners will still be rewarded with all the tx fees, just as they are now.

If everyone shuts down their ASIC units, the difficulty will go down, and GPU mining would then be back. But it's 2140, who knows what's gonna happen in 100+ years.

Couldn't care less about it. I'm not gonna live to see 2100.

Exactly.

Some people think bitcoin will really last for than two/three decades will have a rude awakening one day.

We are building something for the future, even if you are not here anymore, your family and their children might be here still.

Image, after 100 years from now, your grand children find a paper wallet, and finds great Grandpa's BTC stash of 500 coins. And imagine, those coins are worth 8000 times, more than it's worth today. Well you get the point. We will never know, but it might just secure their future.

We cannot just say, we do not care, that attitude, is why we have so much environmental problems today and it will get much worst for our children and their children.

Read the post carefully, and try not, to just repeat what I have said.

1. How long, do you think, BTC will still be in use?
2. Do you predict, that another better Alt coin, will take it's place?
3. Will there still be miners, or would large corporations, again monopolize the mining, and we will again have a centralized currency?

Be imaginative, and think about these things.

Big companies would keep things floating, if this is driving the world economy. Even governments would use our tax to bail it out, if needed. How ironic would it be, if history repeat itself in a 100 years from now. {Like governments now, manipulating fiat, to keep it alive}

If not BTC but some other crypto currency, they developed.

At that time you will much likely to be dead, no offence.

So? Why everyone uses this excuse?
You think our kids, or grand kids want to use Bitcoin if they ask what happens at 2140 and we just say that we don't give a shit because we will die before it...

The.... Bla..Bla..Bla.. you will be dead is getting old. Read the whole thread and comment please.

Yea, we will be dead, and the people in the future, will say ..." Damn BTC could have been the de facto currency, if only they thought of this "

Nothing is more important, than what you leave behind. Our legacy to our children, is what we do today.... I'd like them to say.. Wow our fore father's was wise people, look what they did.

If the useless politicians in Toronto 50 years ago built the high way they were told to build it today we wouldn't have a traffic problem.. Instead they thought like you, decided it would be a great idea to save some cash.. and now everyone hates them.  Although everyone hates all politicians sooo who cares.