As you look around the site, you will find many and varied thread on this same topic, dating back to when the DDE was first introduced. In my case, it started with a date that made it 14 months from order date, went forward several months, and ended up taking a nose-dive at the end to when I got my car - ten months after registration. It is frustrating, and you do have the option of an orphan, though with the DDE prediction so close, it would probably be better to wait, but as you surmised, you are not alone
So hand in there - the wait is definitely worth-while!