I have no idea how the team behind the game feels about the explosion of hype surrounding the game right now for something that was not their original vision for the game. I can easily see the PvE part of the game being pushed to the side in favour of BR due to how popular it is right now.
From today's FAQ:
"Does Battle Royale mean that Fortnite is abandoning PvE?
No. The team has big plans and is continuing to add features and develop new modes to play, including the previously announced Block Party mode. Stay tuned for some spooky details on our October updates soon."