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There's an article of mine here on Steemit with detail. Basically I use current real data of blockchains. I do a projection based on previous patterns / current project status and simple facts. You can see more there https://steemit.com/ethereum/@digitalplayer/ethereum-price-prediction-2020#@digitalplayer/re-williebeaman-re-digitalplayer-ethereum-price-prediction-2020-20170601t222036220z

Thanks for prediction. But I still have doubt if BTC will be $500,000 per coin by 2020 (in just 3 years).

this is not why I say.

it looks like my article is not clear... I say it will be 100 000 not 500 000