This is how I think they should do it.
First, the WWE title match, The Miz vs Jerry Lawler, everybody expects The Miz to retain here, but I believe this is the chance to do something very unpredictable and unforseen. The Miz dominates the matchup until the end, when the referee is knocked out, John Cena interferes gives Miz the AA, afterwards the King gives Miz a piledriver, and Jerry Lawler is the new WWE champion. After the title match Alex Riley and Miz gang attack Cena with the briefcase and chairshots, Cena has a "concussion" and doctors will not allow him to compete in the Chamber.
Second, the Raw Elimination Chamber, during the entrances, The New Nexus attacks Randy Orton before he heads to the ring, and he is unable to compete. The Raw GM e-mails that they have found two replacements for Cena and Orton for the match tonight, Daniel Bryan and Triple H. Triple H takes out Sheamus right away in the match with a sledgehammer. Finally, it gets down to three Bryan, Punk, Morrison. Bryan and Morrison look like they are going to attack Punk, when Bryan turns on Morrison and Punk gives the GTS to Morrison. Punk tells Bryan to make a sacrifice to join The New Nexus, Bryan says OK, Bryan willingly takes a chair shot from Punk, and Punk goes to Wrestlemania.
The next night on Raw, Jerry Lawler says he knows when it is time to step away and this is the time, Lawler forfeits the WWE Championship, on one condition, he gets a match at Wrestlemania with Michael Cole, the Raw GM agrees to Lawler's condition. The Raw GM, then states since the controveresy of last night's EC, the WWE title match at Wrestlemania will be a 4-way elimination, featuring Cena vs Miz vs Punk vs Orton. Also, at Wrestlemania, Triple H vs Sheamus, and John Morrisson vs Daniel Bryan.
At Wrestlemania, Cole beats Lawler when the revealed Raw GM interferes and helps Cole. Morrison gets his revenge against Bryan, HHH beats Sheamus, and Miz wins the fatal four way at WM.