If it does become a long-term trusted store of value, BTC should trade around $2,000,000 a coin (depending on how many coins are lost and are actually in circulation). That is over 100x the price of where BTC is today.
Where do you get this figure from?
Bitcoin has the basic characteristics of a store of value, the main one being a limited supply. It will need to have some utility for it to be trusted as a store of value so it must succeed in some form as a currency.