The overwhelming opinion here is not surprising: Bitcoin will last forever because nobody can kill it. Of course, that's the opinion you would expect at a Bitcoin fanboy site like this one.
However, I believe that Bitcoin could die out simply because people lose interest. It could be a fad like Tie Dye, Beanie Babies, Cabbage Patch dolls, or CB radio. Or it could simply become obsolete like answering machines, fax machines, laser disks, 8-track tapes, cassette tapes, CDs, and soon DVDs.
If you have never heard of some of these, then let me tell you they were all much bigger than Bitcoin is now, and they are gone forever.
CDs are gone? Well that's first news, man. I didn't know
Your obsolete stuff was once massively popular before it became obsolete, and the reason is that something more massive came up and took its place. Answering machines still exist.
Fax machines are obsolete in most countries (notably not Japan though) because of the email.
Laser disks... errr what exactly is that bird? (seriously, I mean, I don't know what that is. How is it different from a CD ?).
8-track tapes and cassette tapes became obsolete because of the CD
Cd's and Dvd's are still well alive, maybe even more so than blu-ray. For some reason blu-ray never made it to become broadly used and remained a bourgeois thing. I, for one, have never used one, not ever.
And it's funny because following the exact same logic you had here, I'd say that the deflationary system modern fiat is based on is right about to become obsolete because of bitcoin. I have an idea. Let's meet again in 10 years and see which one of us was right
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I'll give it to you: bitcoin also might simply fail at becoming popular and end up like a lot of great inventions that just failed for some reason. Only that it becomes harder and harder for it to fail with every passing day as it increases in popularity. The trend is not exactly that bitcoin is failing at becoming popular. Actually it's quite the opposite, really.
Ok I maybes messed up with my opinion, for sure there will still be someone to use it. But who cares half a million people use bitcoin? And the simple people just want somethibg EASY to use : you got a credit card and you just need to know a 4 number code, easy as hell and it is already the standart.
Bitcoin is not easy to use and it is indeed a very important issue now, but you can trust developers and engineers to come up with ideas to change in in the coming years. This problem is only one because the blockchain is a new technology. Time and hard work will get us a way around that.