Definitely one of the threats to the open web would be the web platform falling behind "native" platforms such as mobile platforms. 10 years ago it seemed that native apps are dead, the web is going to win. And then the rise of smartphones has brought us back to a world where we are forever installing native applications. From what i can see, attempts to make the web faster (SPDY, AMP), safer (Certificate Transparency), more open (AV1) are all initiatives i can get behind. The question is : What are other companies doing to ensure the web retains its place as the premier open content / application development platform.