The fall of the Morsi regime at the hands of the Egyptian military opens another opportuntity for Zawahiri in his home country. His anti-democratic narrative and possible opportunity to rally Salafis and maybe more militant Muslim Brotherhood elements presents a second life to an al-Qaeda in the Sinai that was quelled by losses.

http://www.fpri.org/geopoliticus/2013/08/external-forces-driving-al-qaeda-action-and-zawahiris-global-conference-call