If they go the LMD route with Coulson I will so boycott the entire MCU. And by that I mean continue to watch and lavish money on it while grumbling endlessly.
I think the best solution is the most obvious. Coulson never actually died and Fury faked his death to inspire the Avengers to avenge someone. All the evidence is there in the film, and, even more importantly, it'll cause a great deal of conflict between Stark and Fury in The Avengers 2. Joss loves that type of shit.