*Shrug*, like OS4 is going to make the world go woooooo and run out in numbers to buy it. Sure, there's going to be some 'alternative' people who might be interested and actually buy it (I mean outside of the microsphere of Amigaland) but enough to make it a commercially interesting market? I doubt it.
OS4 would indeed not change the world, but it could be a place to start. But who knows about the future? It would first need to build up a software base and the OS would need quite a bit more rework to get it to compete with other modern OSes.