the obstacle of bitcoin at the moment is the problem of how to stop hackers and the falling market prices, how to restore bitcoin like it used to
what do you think was bitcoin before ? High price and cant be hacked ? No . bitcoin before was the same as bitcoin today . the price maybe lower than the past years but that is normal because bitcoin is unstable and even before bitcoin first came out , the value started too low .
Bitcoin cant also be hack . what can be hack is the wallets/accounts/exchanges because they store the cash of users but thats normal because even on other sites there are also hacking incidents .
Price volatility is also normal because this is the true nature of cryptos including bitcoin . thats why we cannot call them obstacle .
I think the main obstacle of bitcoin is acceptance in the government, that they allow bitcoin to operate in all countries, specially in developing ones.