Again, I don't understand where the big point of contention is here. We've already established that Paramount could take the original, standard definition episodes and toss them onto the Blu-ray discs without in any way increasing their costs or affecting the enhanced HD releases. So why not do it?
I don't believe that we've established that it won't increase costs. Blu-Ray currently has a capacity of 50 GB and DVD 9GB. If seamless branching isn't possible it's going to take at least one entire Blu-Ray disc for a single standard definition season. This means increased costs. I'm Ok with paying extra for this but I'd rather see them release this disc separately or maybe even as a complete series boxset of the unaltered versions.