I doubt it would happen, I just don't want people to think that things are impossible. We're seeing a growing trend of these systems being proposed for urban transport, and a system of allowing carriers to switch lines in real time would be a selling point for a large urban system. A manufacturer could use this system as a technology demonstrator, to show how flexible things are if nothing else.For anyone curious, there are 111 gondolas currently operating in North America in a variety of places - mostly at ski resorts but also zoos, theme parks, adventure parks and cities.
Sure, it's possible but I can't see cabins splitting onto multiple lines being very feasible. The merging back together is even tougher. Especially when high capacity requirements mandate very tight spacing. The switches you speak of are normally only used when parking or launching cabins.