While a Raspberry Pi is much more powerful than your basic router, these kinds of routers are those with genuinely extra features that will strain out a RasPi (

While a Raspberry Pi is much more powerful than your basic router, these kinds of routers are those with genuinely extra features that will strain out a RasPi (for example, multi-gigabit routing, advanced traffic shaping, and in GP's case packet-based firewall with a possibility of deep packet inspection). Until we have decent emebedded ARM-based computers, it is still likely that there would be a reliance on x86 computers simply because they exist.