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)
2011 Ford Fiesta (grey)