Let's cover the previous storage capacity. The N64, DC, PS2, and Xbox. Around 90% of all games for each system did not use even 75% of the capacity for those consoles. I doubt few companies will manage to fill the entire Blue Ray capacity. Ogre Battle 64, Xeno Saga are just a handful of games that actually used the full capacity back then.
If you go over the capacity like Resident Evil 4, and FF7 that's also not meeting the target. Very few, and I mean very few games will come close to the exact capacity.