I see 10% people worldwide using Bitcoin after 20 years. Just like Silver which was $80/ounce in 1980.
I'm sure that in 20 years there will either be very large transaction volume or no volume -- Satoshi Nakamoto
Bitcoin at $600 will also be valuable and will have long term future. Silver at $17/ounce is a precious metal.
I thought you didn't like Bitcoin? 20 years since Bitcoins inception would be 2029. The world population would be around 8.5 Billion by then. If Bitcoin is used by 10% of that population that puts the userbase at 850 million. This is significantly larger than the userbase is today. This means Bitcoin has a bullish future. More users on the network = higher coin price (metcalfes law).