It's still Linux under that software stack. The rest of it shouldn't require that much effort, provided the sources for the stack are 100% open and there's a he

It's still Linux under that software stack. The rest of it shouldn't require that much effort, provided the sources for the stack are 100% open and there's a healthy ecosystem. If people in the community created cyanogenmod and hundreds of other custom ROMs for all kinds of devices, they will also be able to do this with WebOS. If enthusiasts can port WebOS easily to a device, a company should encounter no issues when doing such a port.