Yeah, as @mistahseller
said. New phones are constantly coming out so if you want the N5 you should just get it. You can also make the argument about the One Plus One since it's apparently a better value (without getting into all the CM details). Personally I've been getting phones when they first get released just because I am one of those people that likes having "new" devices. But at the same time I don't buy every new device that comes out.
Also, there's the rumors of android silver. So who knows what's going to happen. There might be a N6, there might not. Just like the Nexus 10 tablet, they still haven't refreshed the original.