It has its fans and niche uses, but I think it has too many problems to be viable as a real currently. It's volatile, is prone to hacks, lacks consumer protection, doesn't scale well, and has a huge carbon footprint. If the global banking system had things like gas wars and a "possession is ownership" philosophy then society would collapse.
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Yeah like isn't there a guy sitting on millions and millions of dollars but he forgot his password and only has one attempt left before his account is wiped? Or another that lost his HDD with the details etc. I think it's pretty stupid to invest in something with such little security or recovery.
My most positive but realistic prediction: Bitcoin is gonna stay around as a pump-and-dump scheme to make the rich richer. Other cryptocurrencies will slowly fade away including (as one of the latest) ETH. They are not suitable as a currency and are more of a ~~gambling~~ investment opportunity. Per default, most cryptocurrencies are a privacy nightmare, especially Bitcoin.
There are exceptions. XMR is fairly stable in value and is actually really close to what many people want: cash but digital. If GNU Taler takes off, there's will be a more comfortable option for paying while retaining privacy, making XMR more obscure.
I assume laws and the state will also have an influence, especially with the climate catastrophe questioning the immense amount of energy necessary to run all of this. Even if crypto were more efficient if it replaced fiat, it's not gonna happen. There's hard power preventing it. Both at the same time is reckless when there are people dying.
Also money sucks in general so best case scenario it gets thrown onto the trash of history.
inb4 crypto shills: Remember that there are people whose income and investments depend on people believing bitcoin is more than gambling.
I'm not really opposed to the idea of cryptocurrencies. I think being able to exchange value without having to go through any middle-men (i.e. banks) could be valuable. It's kind of like cash in that sense but digital.
I am however very opposed to the execution so far:
- Wasteful proof-of-work algorithms that spend way too much electricity.
- Treating them more as ~~stocks/investments~~ gambling instead of as an actual currency.
- New cryptocurrencies seem to crop up every day. This is more of a pyramid scheme than actual innovation at this point.
If those three improve, then maybe it will actually be okay. It's unclear whether (1) will happen ever, as anyone leaving the proof-of-work cryptocurrencies behind for other less wasteful ones just make mining more valuable for the ones that are still mining the proof-of-work currency (as far as I understand). But maybe it will eventually be better, though it doesn't seem that way right now.
(2) happening is a little more likely - it would likely slowly happen if people started using it for actual payments and goods. If goods had a price based on a cryptocurrency, the value of the cryptocurrency would be more stable (I would guess; disclaimer I am not an economist or anything like that). But still, this is not too likely to happen, at least it hasn't happened yet in any big way.
(3) is also problematic and not likely to change any time soon. It seems like we will never agree on using just one of the cryptocurrencies and if we don't, I can't really see it taking off.
So generally, unless something changes with how cryptocurrencies are currently handled (ironically, maybe nations need to step in and "bless" a single one for anything to change), I don't really see a bright future for cryptocurrencies.
Same as their past: Get-rich-quick schemes, outright scams, massive wastes of electricity, criminal funding tools, investment instruments that aren't backed by actual companies making anything (and are therefore 100% speculation)... and sometimes some interesting technology.