If you watch some of the newer US films w/ British, Australian actors/actresses, they now use their original voices thru a digital audio filter which "digitally" removes their accents. In the old days, they had to hire an expensive and talented audio technician to manipulate the voice. It took a long time to do it correctly.
In the near future, Mainland series will undoubtedly go thru this type of digital audio transformation/filtering/manipulation/re-dubbing/etc.... As long as they don't go over-board it can enhance clarity and be more enjoyable to watch.