El Salvador made bitcoin a legal tender, Singapore has not made bitcoin a legal tender, the second country that makes bitcoin a legal tender is Central African Republic.
There are many crypto friendly countries that do not make bitcoin a legal tender, but still accepting it as a means of payment and for investment.
Between El Savador and Central African Republic have made vitcoin as legal currency transaction but still can't give bigger impact with bitcoin price. I think when Singapore try to male bitcoin as alternative for legal currency transaction will give posotive impact. We can't guarantee Singapore agree to make bitcoin as legal currency transaction. But nowadays have many countries give positive respond about bitcoin, maybe few years later will have many friendly country will make bitcoin as legal currency transaction.