I doubt this will change the trend of most people shooting with their mobile phones.
With phones selling well above 1 billion pcs/year, no camera manufacturer will likely be in a position to change this broader societal trend. But Nikon seems to test out with the DL, how they can improve the conversion rates from this large untapped user base.
For most of this audience the step towards D-SLR is to big of a step - this market doesn't grow overall.
Traditional compact cameras are too close in their capabilities to the abilities of smartphones. Smartphone user seem to put their compact camera more and more to rest. Let's take the overall camera market development as an indication about this development.
So, Nikon is introducing a premium compact line. As usual, the market will ultimately decide if this approach will be successful.
rgds,
Andy