A modular system like the one from RED is completely different. DSLR video is bullshit compared to those. RED cameras have 3k resolution compared to 1080 on DSLR's, and they use the video-specific PL mount and other accessories Nikon has no experience with.. Nikon cannot compete in that market.
.....who is talking about **** video in the first place anyway, does modular need to include video?.....can't modular be just modular still with interchangeable parts etc.....not likely but feasible technically anyway.