Demand is defined by Investopedia as "an economic principle that describes a consumer's desire and willingness to pay a price for a specific good or service." My "only" considering demand based on price is the only way to gauge demand. Awareness alone does not generate demand. People must be compelled to buy bitcoin, in this case. As more people buy, the price rises. When the price no longer rises, that is the point where demand has peaked. I hope that clarifies.