Northbridge
A perspective to the future  is SOC (System On Chip). With it will also decrease the number of components on the motherboard. But bigger chips hold under universality of solution, they have more pins and they are more difficult. Present high-speed buses are series (PCIe, SATA) and they decline the complexity. In the future we can expect return to the standard interface of other circuits using bus (probably PCI express) and maybe they will be connected to the single Super I/O sequencer. Saved lads can be used for another integrated turn like SATA, USB, IDE, SDIO scanner of cards and sequencers of PCI.