Terrorism seems less likely now with no plausible bad actors taking credit. Also the "main stream" terror groups have shifted away from targeting, or appearing to target, fellow muslims. There are certainly people who have axes to grind with Egypt (including AQ #1), but targeting random citizens of a muslim nation seems unlikely. If they got through security at CDG, they might have been able to take a different carrier, although they may have been trying to avoid certain no-fly lists or watch lists.
Although this could have been a full-mission-profile proof of concept, and they're waiting to take credit until they go "mass production".