I think your idea is "reasonable", but doubt that they'll help out. They'll claim it was delayed due to an Act of God or some such nonsense. I suppose if you rant and rave and threaten to take your business elsewhere in the future you might get them to give you a loaner, especially if they already have your trade.
Home in the Poconos, heart in the Alps
2012 BMW 128i Convertible (red)
2013 MINI Cooper Coupe (red)
2014 Ford Fusion (grey)
2015 BMW X1 X Drive (on order)