He believes that his hobbies might change with the world as the world changes. However, he must choose those things he loves doing them so that he can derive satisfaction and enjoyment from doing them.
He does not believe that he can last very long from doing things that he does not enjoy. It's just like making money. If one chooses something he hates doing as a career, one will not go very far in that career. Just for the sake of making the money? Pick something one enjoys and working everyday is like a hobby to one while making the money.
"Other things I like to do will change with how the world changes and most importantly I must enjoy those things I choose to do. If not how am I going to derive satisfaction and enjoyment from doing them?" - Sean Toh