A recent article I read talks about the comma and how some people think we could live without it. The article uses an example: “Let’s eat, Grandma” which is a simple request to Grandma for food, but without a comma is more sinister. It also says that instant messaging (WhatsApp, Skype etc.) encourage the dropping of commas.
Well here is my opinion, you probably could rewrite everything to remove the need for the comma, but why do things twice? English can, and should, be written in a simple form but avoiding the comma means a lot of nuance is lost, as this sentence I hope demonstrates. So lets keep it, and use it when it helps us.