Of course if claims are patent eligible, they must still be novel and non-obvious in order to be patented. The fact that an "inventive concept" is not required for certain claims to be deemed "patent eligible" does not eliminate the non-obviousness requirement of Section 103 of the Patent Statute. It only means that an inventive concept need not be established for the claim to constitute statutory subject matter under Section 101.
Keep in mind that the Revised Guidelines do not have the force of law, and the courts are not bound to follow them. Time will tell if the courts believe that the Revised Guidelines correctly apply the Alice opinion. In any event, the Revised Guidelines appear to be a welcome development for patent applicants seeking to protect computer-implemented inventions.