I don't know, but im sure if the price of this is not over 500 usd in the next 2 years, then it will be less than 20 usd or even 10 at that time.
Lol... Yup, it will be over USD 500 in the next 2 years.
So the second part of your sentence is really unnecessary.
Im sure that in 20 years there will either be very large (bitcoin) transaction volume or no volume.