So they put now 5 episodes on blu-ray instead of 4 on the DVD sets? So they should rather stay with 4 episodes and put more language audio options on the disks. This should NOT significantly increase the price. The blu-ray releases of TV series that I bought have max 4 episodes and the price was not higher but rather lower than for the new TNG sets.
On the TOS Blu-rays, some discs would have 5 episodes, some would have 4... they alternated back and forth. This is just an assumption, but I think the reason for it had to do with the seamless branching of original and remastered shots. The discs with 4 episodes probably had more branched shots than the discs that had 5 episodes.
TOS was also VC1 compression, compared to TNG's AVC. I would, of course, like you, prefer that they stuck to 4 episodes per disc for TNG (to maximize the bitrate
