Of course the above facts are very important to make Bitcoin a popular payment method and for that to happen more and more businesses should combine Bitcoin with there systems for that to happen stake holders should know the value of doing that and the best way to do that is do more promotional campaigns and inform the public and mainly business communities regarding the importance and advantages that can gain with Bitcoin for the financial sector which is significant at this moment because many people only see the dark side of Bitcoin and many wants to let that happen too but if Btcoin becomes a popular payment method I believe many will use it over fiat currencies

That's right. As much as cryptocurrencies can provide such option to be an alternative payment method for good and services just like the humble beginnings of internet banking or credit cards, it depends on the country or the local if they want to allow that. It will be good for the people because having more options is always a good thing; however, if it can be exploited, especially in this case, with cryptocurrencies, by people who can hack the system, governments would have doubts on implementing it because of the risks. Maybe, that's why, not so many countries put cryptocurrencies up as an option.

Although Bitcoin is now widely known and has various functions including online payment systems and investment assets, the basic idea of Bitcoin itself is as a medium of exchange that can be used in transactions. Although the legality of Bitcoin is still attractive in some countries, the number of users of this digital currency continues to increase.
As an online payment system, Bitcoin can be clearly cultivated for several reasons such as exempting transaction fees and freedom from conventional currency risks. While as an investment asset, Bitcoin also has the privilege of experiencing tremendous impressive value growth, making it dubbed as digital gold.

Making bitcoin a popular payment method is the only way to make bitcoin more demanding in the among people and specially in trades and businesses and it can done by requesting payment options to implement from merchant sites like you have mentioned above and the other thing we can do is to make bitcoin more popular through social media in order to convince company owners and business community that there will be clear advantage they can gain by combining bitcoin as a payment method in there businesses 

One astounding feature about the Bitcoin payment method is the total owner control over transactions. Due to the decentralized nature, Bitcoin offers its users the ability to perform transactions without any middle person interruptions. Also, Bitcoin offers low transaction cost, security and fast transactions.

for me I know each country has its own legal method to use bitcoin payment to its users. Because cryptocurrency is not a money because he is an enonomy of the world and we need support for trading and market

I agree because in order for customers to pay bitcoin and shop owners or other business to receive payments the currency price should be more stable during the payment and if it is unstable it might become a big disadvantage for some parties in situations so that is a major problem with bitcoin due to its huge price fluctuations in the past many have second thoughts when adding bitcoin as a payment options in there businesses

Bitcoin is already being used as a payment method although using third party exchanges to convert the coin to fiat. Not very popular one but we're on the right path. Those 3 traits that you mentioned can apply to bitcoin but the main thing to talk about is if it would be acknowledged by the government.

I think the path of bitcoin should change first because it is known as a good investment asset in the world which has made huge number of millionaires during last period of time which is a significant amount comparing with other investment options. But in order to become a payment first it should be promote itself as a digital currency more than a investment asset so its options and facilities should be increase as a currency to the general public which can allow them to consider bitcoin as a great payment method

I think Bitcoin is already captured two definitions out of three. As of now most of people are storing their wealth in Bitcoin and becomes as Store of value. And Bitcoin became unit of account because most of the altcoins are trading with base currency Bitcoin.

And only one left, that is medium of exchange - this is in progress. Lightening network recently released its desktop wallet and if it releases its version for mobile then in no time we will see Bitcoin as medium of exchange.