Being "a digital currency that is not tangible" is not a reason why people won't trust it. As a matter of fact, it is worth more trusting than a piece of paper you are not certain to be genuine and which supposed to hold a certain value. People all over the world have been making transactions with centralized digital systems built on fiat systems, both of which could be manipulated and tampered, something which you cannot do on an immutable system which is Bitcoin.