I can clearly see that there are other cryptocurrencies that are beginning to dethrone bitcoin, showing off there quick and secured transactions, though bitcoin continues to be the king. What does bitcoin need to improve state your opinions.
I think there is nothing to fix with bitcoin, because bitcoin is very good, but only one is possible for us with the problem of delivery that sometimes, long to wait until 6 confirmation ...
I think it would be very wrong to say that there is nothing to fix with bitcoin. Bitcoin currently has many issues like scalability issue, transaction fees issue, mining issues, etc. Although steps are being taken to reduce these problems but there is no concrete solutions yet and until than we cant say that Bitcoin is perfect.