Double-layed Blu-Rays can hold up 50gigs, I believe. This was last time I read wikipedia. At that size, an entire show can easily fit onto 1 disc with one release. Thus making having to buy separate discs completely retarded and would mean anime is even more of a scam than before.
Though, I am somewhat excited for the proliferation of blu-rays players and burners because then you get tons of storage on one disc for regular sized video files.