by that time we must have seen different fork of bitcoin like bitcoin silver, bitcoin diamond, bitcoin bronze and bitcoin transition elements
. well i hope bitcoin is sustained before that time because the coin is already creating alot of headaches for haters and they will be looking for way to shut it down. which means internet will also be shutdown as well. 2020 is 3 year from now. if it takes bitcoin to reach almost $10k in 8 years i do not think the coin will reach $500,000 by 2020. the person that wrote the article is taking a leap of faith.