Maybe I am not understanding the meaning of "massively oversubscribed" but I thought it meant that the demand significantly exceeds the supply. 2 months to deliver a car is a decent stretch of time considering you can go to just about any dealer and drive away with the car you want. And if they don't have it on the lot, they'll find it and trade with another dealer within a day or 2. They all have inventory. I take it that Tesla doesn't keep a lot of inventory on hand.
Elon has said that demand will outstrip supply for the next several years--but six to eight weeks is pretty much normal for any custom built car from Ford, MINI, BMW, Mercedes, etc.