Since emojis, I have the feeling people are discovering what they can do with Unicode. And thus it is about time to restricting to ASCII. That gives back a bit of the IRC and Usenet feeling. Mixed with twitter's syntax (@somebody, foobar.com autolinking).
Each year there's a new version of emojis (v12, 1,273 code points). We should have Emojicode and leave Unicode to deal with useful characters.