We need one. I tend to use 'one,' 'they,' 'he,' 'he/she,' and 'he or she' to describe any particular singular.. depends on my mood and the context. All of those are not without problems.
See also: A Person Paper on Purity in Language
Another of Niss Moses' shrill objections is to the age-old differentiation of whites from blacks by the third-person pronouns "whe" and "ble." Ble promotes an absurd notion: that what we really need in English is a single pronoun covering both races. Numerous suggestions have been made, such as "pe," "tey," and others, These are all repugnant to the nature of the English language, as the average white in the street will testify, even if whe has no linguistic training whatsoever. Then there are advocates of usages such as "whe or ble," "whis or bler," and so forth. This makes for monstrosities such as the sentence "When the next President takes office, whe or ble will have to choose whis or bler cabinet with great care, for whe or ble would not want to offend any minorities." Contrast this with the spare elegance of the normal way of putting it, and there is no question which way we ought to speak. There are, of course, some yapping black libbers who advocate writing "bl/whe" everywhere, which, aside from looking terrible, has no reasonable pronunciation. Shall we say "blooey" all the time when we simply mean "whe"? Who wants to sound like a white with a chronic sneeze?
See also: 5 Ways You Didn't Realize the English Language Is Defective
The Swedish simply invented their own word that meant "he or she" and ran with it. People have tried this trick with English as well, inventing gender-neutral pronouns like "xe" and "zie," but none of them ever really caught on, probably because most English-speakers don't like sounding like they're in a cyberpunk novel from 1988.
The irony is that this was actually solved as far back as the 14th century by using our now-incorrect "they" to mean "he or she." Chaucer and Shakespeare both used it, and it was only in the 18th century that a grammarian named Anne "Fuck Shakespeare" Fisher kicked off the anti-they trend and declared it improper.