1. Remember that Bitcoin is still beta software. Don't put all of your money into BTC!
2. "I'm sure that in 20 years there will either be very large transaction volume or no volume." -- Satoshi
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Point one is partially acceptable in the sense that A part needed more facts for clarification while the B part is right which is the concluding aspect, a simple and softle warning that says don't put all eggs on the same basket, point two is still showing thesame pattern in one except and only you're able to provide a link that ascertain that there may not be an increasing transaction volume in the next 20 years.
So I will go with an ever increasing transaction volume in bitcoin network since it not altcoins we are dealing with here, bitcoin adoption will always increases and same way the transaction volume as long as the thirteen years journey is evident with massive increase, the next 20 years will be an outburst beyond imagination.