I think that the most common way to value Bitcoin is like valuing other currency by another currency.
Seeing to it that we all know all the factors that causes or affects supply and demand equilibrium.
Also the time we hold bitcoins. Time is very important factor.
It depend how will value Bitcoin to another currency it is way to hard to explain if that happen it may cause of not equal of value of bitcoin or it may cause the demands. It must hold your bitcoin it is important to save your bitcoin .