What a useless point of view. English wont always be the dominant language. What will people like you do then?
Is everything a waste of time unless you can directly make money from it? Learning a language teaches you so many things. Things about your language, gives you insight into other cultures, etc., etc.
You have only this many five-years projects left to complete in this life. If you really prefer learning a foreign language to learning quantum mechanics, or computer programming, or how to play a piano, by all means don't let me stop you.
Is everything a waste of time unless you can directly make money from it? Learning a language teaches you so many things. Things about your language, gives you insight into other cultures, etc., etc.