5- Some disks already do not offer regular DD or DTS for the main tracks so you will hit a wall fast, I think, or start learning Spanish or French
[...]
You might be able to get a "collapsed" and reduced stereo image through regular digital connections and use PLII and other to rebuild the surround.
Yeah, this is what I'm fuzzy on.
Actually, I think you were right in your post about the DTS HD-MA and DolbyTrueHD; there is a "core" in it that would be regular DD and DTS and thus it would work like a DVD (possibly slightly higher bitrates such as 640Kbps for DD and maybe DTS-Discrete).