Would be in one chassis.

Imagine the Denon 3910 and 3805 "unioned" into one machine, removing duplicates such as dd/dts decoders and silliness such as D-link or 6 analog cables just to enjoy surround music. The hdmi output goes straight into my Panny plasma. Oh yeah, and one less remote.

If it's doable in a HTIB, why not in higher end domains?

If this imaginary combo sells for $1,500, I'd seriously consider taking out a home equity loan.

Or is it all just a wacky thought?

M60 + QS8 + SVS PB10 + Yamaha HTR-5640 + Pioneer 578a