blu ray lasers are backwards compatible ! the problem why there is no backward compatibility in the ps4 is there is no native hardware inside the console to play the older games ! the ps2 had a fully functional ps1 processor inside to maintain bc ! some very first gen ps3's had the emotion engine and was too expensive ! sony included software emulation on the later model but it wasnt even half as good as
the original launch models. Sony didnt include an emulator or any native processors from previous consoles in the design of the ps4 hence the reason why it has no backward compatibility
There is a rumour that Sony is working on an emulation program for ps4.http://www.eurogamer.net/articles/di...heading-to-ps4