Assalam Alykom
Islam is complete alhamdullah. Allah taa'la says in the Quran:
''This day have I perfected your religion for you, completed My favour upon you, and have chosen for you Islam as your religion''. 5:3..
There is no doubt Islam is complete, but I have seen ''Hayat and Sharia'' on Al-jazeera by Shiekh Qarathawi confirming the need of ''Ejtihad'', updating the Fatwa just the same is Abu Hanifa (May Allah taa'la have mercy on him)who made ''Ejtihad'' on issues that did not occur in his times, but it actually occured in the present day.....
Abu Hanifa never slept between Salat Asha and Fajir for 13 years, preparing fatwa in issues that occured on our days, subhanallah....
Allah Knows best...
Wassalam Alykom