Blu-Ray are fine for now and next-gen. Today's are barely 50GBs, and if they need more space, just use 4 layers. If 100 GBs are still not enough for you, then you have a real problem with developing. Heck, by the time PS4 hits, one Bd will probably already have 100GBs.
I think it would a great mistake to use a different format for the PS4. With the PS2 CDs were already too small for big games, and recent PS3 games show that now DVD space is too less. But with Blu-Rays still having air to bigger sizes, PS4 should just use BD.
updated: 14.01.2012
playing right now: Xenoblade Chronicles
Hype-o-meter, from least to most hyped: the Last Story, Twisted Metal, Mass Effect 3, Final Fantasy XIII-2, Final Fantasy Versus XIII, Playstation ViTA
bet with Mordred11 that Rage will look better on Xbox 360.
