Graduate studies

Personaly it draw me many attention the possibility of studying on a graduate school. Actualy I am on biochemistry and this career offers a lot of subjects of specialisation. In my personal opinion I do not have any problem with studying for whole life and for that would course a postgraduate, but the fact of have many subjects to choose can be a problem not knowing which one to choose, because at the moment all of them seems pretty interesting, only the time will tell me which choose. Although if I have to choose right now to do a postgraduate would be a MS degree on Biochemistry of Proteins and Biotechnology.
The place where would do the graduate does not matter too much, either on Chile or abroad, if the place allows develop of the better way the studies, for me it is fine.
Also I have the fear of that if I do the post graduates studies for make research, then this have become useless in the sense of these are not so relevant on the future or don´t need more research :(. I doubt it will happen but it does not happen until it happens to.