Routers have a few key advantages over most other computing devices owned by the public: routers normally have a public (non-NAT) IP address, they're always on, and battery power is not a concern. If people could install a Tor implementation on their router with just a few taps, Tor usage could expand dramatically. Developers of decentralized social networks might finally get a foothold once the installation problems are gone.
IMHO the best way to re-decentralize the Internet is by creating routers that host arbitrary apps, along with a marketplace of router apps.
The way to bootstrap this idea seems simple: sell a new router with a thin margin, provide SDKs for free, let developers charge what they want for the apps, and take a 30% cut from app purchases. The plan seems so clear that I wonder why I haven't yet heard of anyone doing it. :-)