DolbyTrueHD and DTS HD:Master are capable of the same as SACD and DVD-a (24bits/192Khz). I have not seen any movies yet that went beyond 48Khz (which is already pretty good if not sufficient, at least for movies), but they are technically capable of the typical 96/88.2Khz for DVD-a and SACD.

Choice of format is also cost of production. If the cost of making a BD becomes the same as that of an SACD, then it might come to that. I suspect the backward compatibility of HybridSACD will remain an important aspect for studios. Remember that Sony is also behind SACD!

I think it will be status quo for a while on highres audio. FLAC and Vorbis-OGG (both capable of highres multichan) are increasingly supported by media players and might lead studios to try and sell electronic highres audio content.

See Mojo's signature