Well, depending on what you read, they've already done it on the GTI/GTD only recently...
However, I honestly don't think there's much pressure from BMW on VAG - there are lots of reasons why you might want to choose a BMW, yet for some reason, people don't.
I'd guess personally that the reason is that (rightly or wrongly) they have a reputation of charging you for every item as an "extra", even things that you'd not really think of as "extras" at all - like rear headrests or split rear seats.