So Tundra's "super dongle" that will come out with their tracks will support 5 or so devices(7?) which will also support steam vr devices like pucks,wands, and knuckles. So imagine having your pucks and knuckles on a single dongle(non-index). Imagine all the free usb slots. Might be a bandwidth issue but if I recall pucks at least aren't that bad. For index users or any other HMD with a usb you could just not use any extra slots. That'd be pretty solid.