A lot of people I know here missed their offers but still got a place, but that doesn't mean that's going to happen much in the future. As others have mentioned, university is becoming ever more competitive, and it really depends on the course too, so though there's certainly a chance that if you didn't quite make the grades you'd still get a place, I wouldn't count on it. I'm sure with a lot of hard work and effort you can push those grades up and meet the offer. Good luck!