I'am agree with your statement , until this day I can't understand if 21 million BTC has been create from miner.
I think cost for send BTC will be expensive , because hasrate its very high.

There is a possibility that it can. 21 million is the number of total supply in the world and it will last until hundreds of year to mine all those 21 million. That is lot of amount by the way, it is gettinv harder everyday. If the supply runs out, good luck.

Do you really need to worry about things that will happen  after your death ? 2140 is really very far and bitcoins might not be able to survive by then. If you are still interested in the answer, if bitcoins survived till the last coin was mined, it will be because it becomes a commonly used payment option. And in that case, I see the demand only increasing more in future. Since the supply will reduce as no more mining is done, prices will move up faster.

dunoo , but my opinion bitcoin price will get higher
i have experience about some coin that stop their faucet , and burn their coin to get max supply , 4 month after , the coin rising up from 0,2 to 20-40  $
and i think it will same with bitcoin

I think it will not be possible in a short span of time. Mining only provides a very small value. A year will only give you a small amount which cannot even deduct 1 btc. Mining isn't that gallant that it can give enough to those who looks for free bitcoins.

Miners will make money from transaction fees still, so it shouldn't collapse. They should continue mining to keep the network secure, and people will still run non-mining full nodes as a hobby or for their own security.

2140 is a long time away though. If Bitcoin is popular 120 years from now, there's no way it would resemble the Bitcoin we know today. Developers are already working on ways to have instant transactions off chain, with many other people running nodes to test out this technology. Then you hear about many other ideas that aren't yet being worked on. A lot can change in 120 years.

What about IOTA? There is nothing like that but it is not collapsing. It is not incentivizing miners since they don't have one. Yet it is not collapsing. So what happened to your half baked thoughts? It's collapsing.

I think that nothing will change because as it gets to the last bitcoin there will probably be a high price and it will not change.