by 2020 easily.
We will see very soon another financial crisis similar to 2008. Btc will skyrocket.
No one can really know when that is going to happen, it does not depend on the price though price would automatically grow up if it gets adopted everywhere but basically it depends on adoption level to make bitcoin accepted internationally.
Yes if we find massive adoption in future then it will become an international currency and it will also take price to higher level, but I don't think that it will happen sooner.