When you have a kid, you sign on for the whole package: good, bad, everything in between. you can't just dip in and out, picking and choosing the parts you want and quitting when it's not perfect.
People should not say that this or that is not worth learning, giving as their reason that it will not be put to use. They can no more know what information they will need in the future than they will know the weather two hundred years from today.