Soon engines will have more turbochargers than cylinders. "The new Hex-a-turbo twin cylinder! 5 turbos! MORE IS BETTER!"
All I can think about is how much more there is to go wrong with 4 turbochargers I already don't like how the one turbo I have leeches into my oil system, coolant system, computer system, and both intake and exhaust systems.
That being said..... as long as it's working, it will likely be a very interesting and powerful engine! I kind of like what Audi is doing by supercharging and turbocharging. Instant power, then at high RPM the supercharger disengages and the turbo takes over. Very neat, IMO.