I think this question is more relevant now than when I first posted it.
I'm not sure it will be, to the masses.
The masses of players are not connected, not hyper over exposed to the content online, as we are.
To them, it will just be a cool new book(s) for the only RPG they know/play.
Its pretty weird though.
To some, 1D&D is doing nothing, so why bother as some are already over 5e.
To some, 1D&D is doing nothing, so its great, because 5e is great.
To some, 1D&D is doing too much, and its ruining 5e.
To some, 1D&D is doing so much, and its fixing 5e.
I cannot wrap my head around 2 or 3 of those positions, but I believe in D&D having a critical mass, and just like every edition of 40K, it will be replaced, and people will buy the new books.