Coulson actually surviving Loki's vicious attack would explain why Nick Fury showed Tony Stark (Robert Downey Jr.) and Steve Rogers (Chris Evans) the fake-bloody cards to unite The Avengers instead of simply showing them Coulson's body during the events preceding the Battle of New York.
Fury and select other S.H.I.E.L.D. agents maintained the secret and Coulson was put into hiding (in Tahiti, apparently) before being assigned to the special task force we see in Agents of S.H.I.E.L.D..
But why then is Agent Maria Hill adamant during the pilot episode that Coulson never find out what really happened? They're keeping something from him and it's so crazy/horrible, that not even a high-ranking agent who's dealt with Asgardian demigods can know.
Verdict: No. It can't be that simple.