They should be worried because even though the PS4 is outselling the X1, there is no debate that the Xbox already has better exclusive games on the market and more of them. Now, we have a pissed-off Microsoft coming into E3, a price drop, policy changes and who knows what else, and Sony hasn't been saying anything.
They took forever to get a firmware update out, there's almost no hype for The Order, and it seems like aside from Druve Club, they have no big AAA exclusive planned for late 2014. Chances are any big news that comes from them @E3 won't see a release until 2015, and I'm CONSTANTLY hearing PS4 owners complain about the focus on indie titles, in real life. One of my friends even said if they spend 20 minutes onstage @E3 talking about abstract platformers and puzzle games, he's getting rid of the system because "I didn't spend $400 to play something that could run on my phone".
I know a lot of dissatisfied PS4 owners in my daily life, and Sony needs to appease those people and announce more than just a new GoW or Uncharted. They're in 1st place, so they need to act like it. I want to buy a PS4 myself, but right now its a wasteland and I can't justify it.