The problem with this title is that in the reference, "Have Spacesuit, Will Travel", the character actually has something that's relevant to his travels.
Surely the reference is to the saying "Have Gun, Will Travel" (to which "Have Spacesuit, Will Travel" was also a reference) which was popularly used to mean "I am prepared for anything", which is exactly the theoretical point behind a liberal arts degree (though not specifically a degree with a major in the humanities, though the latter are generally also the former, and the article seems to use them interchangeably; "liberal arts" is orthogonal to the major field of study.)