The fact the we can't manufacture transistors cheaper doesn't mean we won't see big jumps in compute value.We could seem improvements from fpga's(500x max),approximate computing(100x-1000x), packaging(3x-10x) or the radical option of analog computing(6-9 orders of magnitude for brain simulation etc).

Also, there's still huge amount of value to unlock from software, interfaces and the rest.Just look at the iphone where most of the value comes from a great touch interface and an app store. Moore's law is just a bonus.