Actually this strikes me as a fascinating opportunity.

This underlines how dead DRM is. But it also gives a new opportunity to provide a service for the majority of people.

BT provides some large % of all home ADSL routers in the UK, and they slice off a % of each router for their "wifi-anywhere" service - its roaming for BT subscribers, you park outside my house, you get to use my cordoned-off router bandwidth and vice versa.

Now the majority of problems will come from "poporly-behaved clients" - but if the majority of clients are simply running in the backgoround on most routers most clients will be well behaved