Getting Sailfish on Nokia devices and other devices will probably be possible for community, but you have to remember there will be closed proprietary applications, so it may not be end-user ready, I think this is what they mean by "not be optimal". You'll basically have to use those apps that are available for Nemo to get the functionality you require from the device. In which case, I'd suggest just helping to get Nemo more feature complete and working for your purposes in the interim.