By now, questioning "who are they" is naive or plain weak.

The unknown subject is a valid construction in language. It is not necessary to be able to answer "who's they?". It is semantically equivalent to saying "I knew the rules would be changed."

There are also perfectly ordinary situations in which this pattern is used to imply the influence of an unknown party. "They built a bridge over the river." Clearly the speaker does not believe that bridges over rivers construct themselves. She doesn't need to know who built the bridge.

Open your eyes? Everyone on the top 1000 Forbes and at trumps inauguration?

Yes.