You may be right in the last point of its long term success but I do believe in Bitcoin as it has a great number of followers and most of them also believe it to be the king of cryptos. You say BTC is not known by many people but then how do you think its rising so fast. With the price at $4400 per BTC people are still buying it and its just not those who are already in it but also those who are new in the market. BTC is being adopted world wide heavily and is going to be spread out through out the world and that is the reason why it is going to be successful crypto currency in the long term.