According to Billionaire Mike novogratz, not only would Bitcoin recover from its present downward trend but he is forecasting a 20 fold increase in cryptocurrency market capitalisation. Figures shows that the highest market capitalisation ever witnessed was $900B, it would therefore take nearly a 20 times increase to attain the forecasted $20 trillion.
In my opinion, I think it's possible considering the fact that we only have about 7 to 11 crypto users presently and adoption rate is still minimal. With mainstream adoption, then $20 should be possible. This is just my opinion, please feel free to share yours?
Can we reach a $20 trillion market cap by 2028 ?
It's not impossible considering the mass adoption of Bitcoin like you said.
But technically,what scares me off is that during the December-January 2017 uptrend the market cap was 318-330 billion but we clearly saw that there was huge fees and alot of transactions stayed unconfirmed for a long time so the conclusion is we don't need only adoption,we also need upgrades the capacity of supportingg multiple users and we see this currently like Segwit,Lightning network...