I seriously doubt they will ever put out the Sold Out sign. They have the capacity to build 40000+ units and if the demand is there they will make every effort to do so.
I believe the initial allocation is just that, initial. Once they get past the initial pre orders and things settle down they will have additional allocations and that will happen before 9 months into the build cycle. Then again, if orders slow the all bets are off but then there's still no sold out notice, they build as many as they can get orders for.
Forget about the months people have had orders waiting, that's called early adopter syndrome, not situation normal. The reality is they have only been shipping cars for 2 weeks, there's at least 44 more weeks of 2014 shipments before 2015's start rolling off the lines.