So let’s talk about the streaming,
it show a way of playing DnD, more social, role play, and joyful.
if their audience continue to grow, it will become a norm, a common way to see DnD. much more efficient than publicity or new product launch.
there is no war, streaming show their way of DnD without any response by other playstyle.
i don’t know how people will react and change their way of playing the game according to the popularity of the streaming play style, but usually people tend to mimic and redo what they like watching.
i don’t what WotC will do in response to this free publicity campaign, but I can guess that they will go with the flow.