Such is the way of things. Any good business is going to cut costs where they can, in pursuit of the "sweet spot." It's a science, really. It's like finding the "perfect" algorithm for weather prediction. Or Moore's Law — things will halt when a point is reached where shrinking provides no additional benefit or actually becomes detrimental. Or how markets tend to shift towards a monopoly — point in case the GPU industry. Once it had several vendors, now it's down to two. As time approaches infinity, the probability of a monopoly becomes closer and closer to one. There are laws that prevent this, but unrestrained, the universe would favor a single, global distributor for pretty much every good.
In this case, it seems that the savings from soldering a chip to the system board outweigh the savings from flexible upgrades and individual component replacement. Caches used to be separate form the CPU — now they're integrated. Memory controllers are now integrated. Graphics are now integrated. Someday we probably won't have anything that resembles a motherboard at all.
I for one, embrace our new embedded overlords.