Then why didn't they do this sooner then? I think it would've save Sony a lot of money in the long run if they would've released the PS3 slim at launch. If my math is right then 70% of $600(not including tax) is 180 and so they would've most likely gained a surplus than suffer a defecit of the PS3's production. So what do you think?

Then people wouldn't of bought current ps3 models, now they will get a huge sales boost.

Its a boost to the lifespan of PS3.

Also, they wont have had the tech for a slimline version when PS3 released.

the technology was still too expensive.

This.

The cost reductions come from die shrinks, motherboard shrinks, pretty much all internals getting shrank and now the exterior (for the Slim).  The shrinking only comes after a mature manufacturing process.  In other words, it would have been a lot harder and taken them a lot longer to produce PS3's if they had wanted to start out with 45nm chips.

So if they would've started out making the slim, then not only would it be time consuming, but it would have a shorter life span? But with the original PS3 models, it would have a longer life span. So here's another question, how many people do you think are going to buy the Slim?

no, what he means is how can you start out on the slim without having time to experiment with technology. Its kinda like saying why didn't they start out with dual core cpu's instead of single cpu's for computers, technology advances over time.

Dont know for sure if it would have gave a shorter lifespan, but bringing out a phat first, then changing to Slim version will help prolong the lifespan.

As for your second thing, LOTS. 

So... you didn't want the system to launch until Summer/Fall 2009???

I was just saying why didn't they do it at first since it porbably would've saved a lot of money in the long run. But, I forgot to factor in the time it would take them to actually finish it. By then the competition would've probably surpassed them at a huge rate than now. (I kinda feel like a moron for forgetting that >_>)