yeah its a fine idea to buy a btc today as many of ecnomiists think that btc has a godd and bright future and value will only raise as it gets more renowned by the people and the day is not far away when it will be started as currency over dollars. But as we know bitcoin network is very volatile like chemicals so yes it worth as long term investment but it will be more safe if you keep a boundy that on reaching 600$ you will withdrawl your coins