Justin, are the plugin interfaces also GPL3? If they are LGPL (or other lax license, Apache 2.0, MIT, BSD, etc) a person could make closed source plugins for OM.
Also, as a side note, my sources confirmed that Garmin and Tomtom do tivo-ize their devices to an extent and have no GPL3 software in them. It's basically impossible to be certified on telco-networks if you don't tivo-ize certain things. I did quite a bit of research into the gpl3 when it came out and even at one point considered it for nghost. To make it more OEM friendly we kept it GPL2 and enriched the IPC API so that you could make calls into nghost from a closed application without violating the gpl.