My understanding is Lossless PCM is the ultimate track, the best the sound is meant to be. TruHD and DTS-HD MA after decoding will be equal to the PCM track. Beside the space savings, is there any advantage to have TruHD and DTS-HD MA? Am I right to say that with 50G Blu-ray, there really isn't a need for TruHD/DTS-HD MA? Should Dolby and DTS be worry?