I could see some marketing potential in selling MGS1-5 on one dic (assuming PS4 has full b/c), or Halo 1-6 + bonus Halo Wars 1-3 + the making of Halo doco, and the cgi movie which bombed at the box office, and the animated series 1-3 from the Cartoon Network...
Rinse and repeat for all the other great game franchises. Bring all the greats of the past to a new generation while still providing a shiny new game. All on one disc.
Of course if you have a 500Gig BR disc you can just about do this without the new tech.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix