^^Dude for the love of all that is holy can you PLEASE stop going on about what the ME3 devs said about the game. Everyone knows that devs just spew a bunch of PR and taking their word for anything that relates to their game is like trusting a complete stranger to hold on to all of your money.
Also I would like to say it's just as much speculation that the Sol Mass Relay could have a big enough explosion to destroy Earth. Mass Relays don't automatically destroy solar systems, they destroy whatever is in their blast radius (which to be fair is pretty freaking big). Basically if there's a Mass Relay waaaay at the end of the solar system (like it is in the Sol system) it probably won't be hitting Earth...especially if Earth is on the opposite side of the sun from the Mass Relay. Like it or not there is a better chance that Earth survived than got destroyed from the explosion.