Yes bitcoin is growing but it is really nothing to be cheering about! Comparison has to be done between apple to apple. banks have their own limitations and rules to play with. They are bound to follow such rules and also they are limited geographically to some extent. On the other hand, Bitcoin has no such compulsion. It can easily reach people from to all over the world where internet connection exists. So the scope of Bitcoin is much much larger than banks. So having a bigger market cap makes sense! It will become a reason for worry if it's other way around or it becomes that way in the future.

Bitcoin is larger than banks in size but with less number of consumers! Thank what will happen when the human adoption of Bitcoin grows! Can you imagine the scope?