Sounds like your dealer is bending over backwards to try and get you a car. Either be patient and eventually get a Mercedes, which nobody else will be currently able to order, or cancel it and wait another 6 months + for something else you don’t really want. Nobody is getting cars of any make quickly any time soon.
Very wise words 72 dudes. As you say, there are just two options, one of which many people would be very glad of. Unfortunately, ranting about it regularly on multiple threads achieves nothing other than raised blood pressure!