1. Either the EU members did not want this trade agreement from the start, or they will use this as leverage to get a better deal, or something extra.
2. The various EU member countries knew full well what was going on. And have their own spying operations and networks in place.
3. The various EU member countries would do the same type of spying as the U.S. does - if they could.
The idea that the U.S. should just "play fair" is so naive that it's self-destructive. Because no one "play's fair" in this world-wide, complicated, and high-risk/high-reward game. This is how the economical and geo-political game is.
And this is why these leaks are so damaging to the U.S. and its citizens. It exposes the truth, for the sake of the truth, and does nothing else. Because for that something else to happen, whatever it is, it has to happen on a global scale, and since countries are in a natural state of competition for resources and benefits, it can't, and the game remains the same...
That is, we can stop the spying, but no one else will. We can stop the exploitation, but no one else will. Doing so will just cause us to drop down to the lowest rank in this game, while everyone else runs to grab what's left on the table.