Like fashion and couture,language too changes over time.Worn-out usage falls into disfavour and becomes archaic.In order to acknowledge change you don't necessarily have to brush aside grammatical rules.Of course grammatical errors keep a message from being understood properly.But as long as the meaning to be delivered is being clearly brought out in the sentence,there is no reason why the language should not expand to accomodate that change.Linguists across the world understand this emerging trend.I guess its going to take ages for the examiners in our part of the world to wake up to this fact.