encryption is really just "weve got this very large number and it takes this long to factorize". Thats how bits work. Whatever kind of meaning youre trying to assign to them, if you take n bits, youve just got a group (math) that is isomorphic to the finite group with n elements. Breaking encryption means figuring some details about the number out. That might take a while because you can make it really large, but thats it. From a mathematical point of view, encryption isnt really an interesting field.
The proposition of quantum computers guerilla was referring to would nullify encryption because such a device would gain access to a space of higher (possibly infinite) order. Difficult to explain, especially when i dont know how much you know. A quantum computer is to a computer what infinitely many supercomputer are to a first grader.
Even if "better encryption" existed, it would have to be formulated. you get an interval of time during which bitcoin is just not protected at all, which would drive its price down.
Then if you had one of those computers, wouldn't you also be able to crack bank passwords, email passwords, and everything else? Any type of online encryption would be useless and the internet itself would become useless.