Regular old graphics will not fill up a standard DVD. the only time you need blueray is when you have a LOT or audio and FMV. A bajillion pollies won't do it.
Yes there will be some japanese RPG's out there taking up multiple disks, they do like the FMV, but it will be hours between disk changes. I'd prefer to keep my 200 bucks and swap out a disk every 20 hours.
"There's always money in the banana stand." - George Sr.
"Pants! Pants! Pants!"