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It will cost less to produce.

That is the real reason SCE makes them as well as the reason why there will be a slimline PS3.

There's already a significant difference in both number of components and overall weight between the original 60GB model and the 40GB and 80GB models. Continued die shrinks will only continue this trend as components require less power to run (= smaller/lighter PSU or AC adaptor) and produce less heat while running under load (smaller, lighter HSF cooling solutions which currently occupy a sizable percentage of chassis space).

There's already a fair amount of empty space inside the current 80GB model if you've seen a tear down.

Plus a new smaller case will cost significantly less as well (the original supposedly cost about $60 to produce).