I disagree that production is over a year away. Tesla has repeatedly stated that full volume production will begin in late 2020. However, we all know that there will be a 9-12 month ramp up period. With that said, I think we'll start seeing a few Model Ys coming off the line in Dec 2019 to March 2020.
I really think Musk learned a great lesson with the 3 - he doesn't want to go through that hell again. And remember, they can probably build the Y on the same lines as the 3 (like how the S and X are built on the same lines) - so it's really just a matter of getting the stamps made for the 30% difference between the 3 and the Y. And honestly, I wouldn't be surprised if the Y wasn't at 1000 per week by July or Aug of next year. I really think Musk wants to reverse the "late" and "production hell" damage his mistakes caused to his reputation for providing accurate timeline forecasting. He needs the Y to be a "surprise" early. When it actually starts production and actually ramps up has no bearing on this - only the expectation Musk sets for it - and I think he's totally sand bagging on this one.
Obviously I have no source for this and is just my gut feeling.