Probably won't hurt sales. Not so sure if it will help sales though.
I for one am a little curious about this development (L mount stuff). I have resisted the idea of investing or investigating beyond M/LTM and Nikon F lens mounts. Those comprise the bulk of my photographic system. Sure, I have a smattering of lenses and cameras of various other mounts, but they represent dabbling and messing about.
However, this L mount thing might provide a flexibility (platform, price point, format) that draws me in. If that were to happen, I would likely divest of Nikon. But, this is all just a thought exercise for now.... Clearly.