the only challenge that i can think of which really matters is adoption. and that is not something you can fix, it is something that is fixed on its own with time.
as time goes by more people find out about bitcoin and more of them start using it. some are merchants and some are users and they all make the ecosystem grow.
Not all people can adopt to the bitcoin thing because they are digitally used unlike the fiat and besides there are limited stores that are accepting it as a payment so it is not that easy to use bitcoins in this time because they are not that accepted at all market. But as time goes by the people get to know it more and more people use it. But the temptation also is one challenges if you are a user because sometimes the price falls and you want to buy so you will lose money if you sell them you have to have a lot of patience