the bdc-202 is not a 5x reader. it only reads single layer (25gb) discs at 5x. it'll read dual layers at 2x, just like the ps3.
Although I agree, for movies, the read speed is pretty irrelevant, PC drives are already getting much faster, the BDC-202 is possibly a bad example..
The LG combo GGW-H20L is 4.8x read for dual layer BD-R/ROM
However, if say speed is an issue for Java loading etc, why wouldn't Sony as and when just incrementally speed up the BR drive in the PS3 as technology increases, sure older consoles will load slower, but why penalise newer consoles just for this?