There have been times of extreme urgency when Constitutional Rights have been suspended in the past.
They were always restored after the emergency.
Onlt the paranoid and criminal need worry.
And when will this "emergency" be over? We knew when the civil war was over because the confederate armies surrendered. We knew when WWII was over because Germany and Japan surrendered.
This is not an "emergency" that will ever be over - at least not in our lifetime. As long as there exists those that practice Islam, there will always be the chance of Islamic terrorism.
A good rule of thumb is that an war against a non-proper noun (poverty, drugs, terrorism) will never end.