what if nobody want or accept Dollars in their store or service or something like that.
what will happen ?
do you even understand how it works ?
if it's just an empty numbers on internet,why many people use Paypal,Neteller or something like that before ?
they're exchanging their Fiat to that crap or so called 'empty numbers' to pay their bills or buy something.
to make it simplier and understandable for you.
bring your FIAT (Dollars,because you mentioned it above),and spend it in ASEAN countries.
use it directly and buy something in there,
can you do it without exchange it ?
it's all about demand from the users or peoples.
there's no what if what if.
If nobody want or accept Dollars than those who received the loans and exchanged them for goods and services would not be able to settle their obligations to the bank. As a result, the bank would seize the collateral to recoup its losses and finally, those who have deposits would get some immovable or movable property.
Now it's your turn, if nobody want or accept Bitcoins what can you do with them?
If you go to some foreign country with dollars in your pocket, your dollars are not worth anything. You have to go to the exchange office and exchange it for local currency.
Similarly, if you want to send money to someone who doesn't accept bitcoin, you have to exchange it for the currency that is accepted (mind you, bitcoin is starting to get accepted more and more).
Alternatively, you might be able to pay with a card without having to exchange your currency, but that just means someone else did the exchange for you.
There is not much difference between dollar and bitcoin in that regard.
If bitcoin gets obliterated, some would have won, some would have lost.
If dollar gets obliterated, banks would have won, everyone else would have lost.
You see, you loaned your dollars to the bank (if you have it in their account). If it's suddenly worthless, too bad for you. Either the bank can give it back to you although it's worthless (good luck with spending that), or it can't give it back to you because they don't have it (ask for example someone from Greece if they were able to get their money not that long ago). Either way, there's nothing in for you, you're not getting any property (bank only owed you some dollars, there is no collateral here, as opposed to when you take a loan from the bank - i.e. bank giveth, bank taketh away). Theoretically, depending on the law, you might be able to apply for some of the property that bank seized, but with many people applying, you are getting next to nothing.
Value comes from utility - the capacity of an entity to satisfy human wants. Number on your Bitcoin address does not have such capacity. If nobody want or accept Bitcoins you are unable to take legal action in order to get some kind of value out of them that can lead to satisfying of human wants. Hence, Bitcoin doesn't have any value of it's own. If people are buying X, and X doesn't have value of it's own, than this is irrational behaviour and not something that gives value to X.
Value comes from utility - the capacity of an entity to satisfy human wants. Number on your Dollar does not have such capacity. If nobody want or accept Dollars you are unable to take legal action in order to get some kind of value out of them that can lead to satisfying of human wants. Hence, Dollar doesn't have any value of it's own. If people are buying X, and X doesn't have value of it's own, than this is irrational behaviour and not something that gives value to X.
You see, if you have XYZ dollars in your bank account, and dollar gets terribly inflated, bank does not adjust your account value for that inflation. They still only owe you XYZ dollars, which in this hypothetical situation is worth (next to) nothing. Same thing if you keep your dollar in your pocket, you can now buy something with it because someone said so, but if they say you can't do it anymore, then you just can't.
What I think you misunderstood about bitcoin is that you think it's just some random sequence of numbers. Well, it's not, at least not more than the sequence of numbers in your bank account. The only major difference is who's controlling the flow of these numbers and what they take in return.