Every word was once a made-up word. Every language change was once viewed as a mistake. Everyone who complains about the rules breaks them.
First Amazon erased 1984 from Kindles. Now it's starting a Fahrenheit 451-style assault on books printed on paper: nyti.ms/1jhBnFa
Don't like singular they? You has been both singular and plural for 300 years, and no grammar sticklers yearn for the days of thee and thou.