According to my optimistic forecasts, Bitcoin average prices in 2020 could be $1,276.5 USD, my moderate scenario is $861.5 USD. I base my forecast on a higher trading volume and the potential BTC market share in worlwide e-commerce.
I think prices are going to boost toward 2024. My moderate scenario expects $2,807.3 USD per BTC. I think it would be a reasonable evolution for BTC in long term.
In my very optimistic scenario, I believe BTC can touch a roof of $4,200-$6,700 USD in some moment of the next decade. I believe it, but i'm not expecting it.