Al Nusra does not only want a 'Syria without Assad'; It does want Syria!

"... According to Site Intelligence group, Nusra claimed responsibility in one day alone last month for 45 attacks in Damascus, Deraa, Hama and Homs provinces that reportedly killed dozens, including 60 in a single suicide bombing.“In 18 communiques issued on jihadist forums ... most of which contain pictures of the attacks, the Nusra Front claimed ambushes, assassinations, bombings and raids against Syrian security forces and ‘shabbiha,’ pro-Bashar Assad thugs,” Site said.
Members of the group interviewed by Reuters say Nusra aims to revive the Islamic caliphate, which dates back to the Prophet Mohammad’s seventh-century companions, forerunners of the large empire that once stretched into Europe.
That prospect alarms many in Syria, from minority Christians, Alawites and Shiites to traditionally conservative but tolerant Sunnis who are concerned that Nusra would try to impose Taliban-style rule.
Fear of religion-based repression has already prompted Kurds to barricade their quarter of Aleppo city and was behind fierce clashes between Kurdish and Nusra fighters in the border town of Ras al Ain in November..."