Is it really neccesary to scrap the old system, though? Pixar has proven you can run multiple rigs and switch between them on the fly. I would think it would be possible to have a legacy system, and a new system existing side by side. That would preserve the investment, and allow those content creators who are interested to make a new rig for a product, and release just that; either as a paid upgrade or a freebie. And more than likely, someone would kludge up a way to use the old system for some things, and a newer system in the problem areas.