When LR start using silly abbreviation's for their car's like Peugot/Renault etc d, then that's when they'll lose sale's. Buying a new LR is not buying a matchbox on wheel's, but a car that is different and is a statement in itself.
As I understand it the LR3 was only so named to try and disassociate the model with the D2, due to the Discovery's appalling reliability record in the States.