A recent article from BMW said they are not likely to bring it back. The biggest problem was that 10-12 years ago they had enough people ordering cars that it made sense to have a full-time crew just for customer delivery. The X3,X5, and one other model are made at the spartanburg NC plant. BMW lets you take delivery of any model at the USA factory.
BMW has one of the largest, if not the largest, brand equities in the world. That is to say, the premium one pays for a BMW over a comparable generic car, times units sold. Bigger than Apple, Mercedes, etc.
Even if 1/100 of 1/% of their US buyers take European delivery, it's a good "halo" project to lend cred to all the soccer moms who buy white SUVs made in North Carolina.