That's the current prediction because of the backlog. Family-based migration is different. On a H1B visa, if you get a priority date today, it'll take you a very long time to get your green card. Every year, the backlog moves by 1-2 months. i.e. in the last 6 months, I think the backlog went from processing applications from April 2009 to June 2009. Some months it doesn't move at all. I don't think you know how this system works. Of course, people exploit family-based migration which is more permissive and bring their extended family here but the situation is completely different for people on work-based visas.