I don't think its just about cost. I think its about making a Porsche for what they should be for - having fun, blasting round twisty roads or weekend track days.
That it will, it will make it easier for those that already want to spend $30k to start on a car to go for a 718.Affordable is a relative term. I think that the 718 will be accessible to people who previously weren't willing to buy a Porsche because of the price barrier.