The problem I see with bitcoin (gee, this has never been a topic here before, so why the deja vu?) is that there's NO FUCKING REASON to spend it. You can use fiat so much more easily, and with greater protection, than bitcoin. I get paid in US dollars, right? Well, why would I buy another currency just to spend it ON THINGS THAT ARE PRICED IN USD?
I apologize for my caps rage, but that's the big elephant who just took a shit in the room. Everyone sees the elephant and can smell the shit, but no one wants to be the one to mention it. Bitcoin is superfluous. I do think it's a good investment as long as everyone agrees that it has value, but as a currency it sucks the big one.
lets first talk about fiat
on a good day, you can rely on banks to hold your funds with the blanket of protection that if proven that someone other then you takes funds without authorisation. The bank will just magic more money into existence to compensate you.. which happens to a person once every 5 years on average.
but every day, banks magic money into existence in many ways(mainly loans). meaning that a $10 you have now, would have bought you 30 loaves of bread 15 years ago, but will only buy you 5 loaves of bread this year. in 30+ years(whenever you retire) may only buy you 1 loaf of bread.
this is not due to some hacker directly stealing from your account.
on a bad day the banks could take some of your money without your acceptance. first they start with fee's then they start with negative interest.
ensuring your left with a bigger loss to buy even less loaves of bread when you retire.
on a very bad day they can go bankrupt and only give you pennies on the dollar (their 'protection' has cut off limits)
look at the Zimbabwe dollar, look at greece.. how many loaves of bread can you buy now with a set amount of Zimbabwe dollars that you could 20 years ago, how many loaves of bread can you get in greece now that you could have just 5 years ago
in short saving fiat for retirement will never give you back more then you have put in.(if you use the breadloaf value measure) even if they gave you $20 for every $10 you put in, it still will equal less loaves of bread when you retire
with the events of 2007-2008(banks go bankrupt, banks negative interest, bank debt, retirement investments evaporating) which woke some people up to the 'bad day' side of fiat.
its NOT about putting ALL your funds into bitcoin today.
yes we are still in the early stages and its silly to tell people to drop FIAT to go 100% gold, or 100% offshore or 100% bitcoin. but just dont go 100% fiat, because fiat buys you less loaves of bread as time goes on. bitcoin is only used by 0.3% of the world occasionally, and even less as a full time living-lifestyle choice. meaning bitcoin is not useless to spend direct.. but still in the early days of mass adoption
its about in realistic terms allowing anyone, even the unbanked to have an offshore place to hold value that is not storing $10 as $10 but as its own value to hedge against fiat value, much like the rich hand over fiat to off shore trusts measured in assets, but without the headaches of 2-5 days to cash out the funds from the 'institutional trusts' they set up.
its about having a safer place to store rainy day funds to save up for later knowing you can spend them without as much of a headache of dealing with institutional trusts. its about thinking of the future when you know people wont be able to rely on banks as much. its about having a contingency and not putting all your eggs into one basket(greece suffered by relying on euro banks as the only egg basket, and now they are hurt).
right now bitcoin is the middle ground between having an independent 'trust' of value, with the digital platform to spend it on goods direct.. without having to directly cash out, taking 2-5 days to then buy goods. which is the problem institutional trusts have.
right now bitcoin is the middle ground between having an asset of deflationary value, with the digital platform to spend it.. without having to find a specialist to barter to cash out, taking time and labour to then buy goods. which is the problem physical assets(gold/antiques) have.