Please. No. Los Angeles does just fine without a football team. If we get saddled with a stinker of a team, all the good games will be blacked out every Sunday.
I am sure the Falcons, Panthers and Bucs wouldn't be too pleased with the road games being an extra thousand plus miles away. They'll be the first to complain (unless, of course, the owners get promised an extra cut of the relocation fees; then the players will be told to accept it for the good of the league).
Which begs the next question, what makes the NFL think that fans are going to want to watch someone elses local team (and a bad team at that) play?
What you said. Besides, I don't want any NFL team to screw up my USC season ticket location in the Coliseum.