Saphra Deden,
Not a bad "dark side" argument. Let's have a quote from another story. Saruman take it away !
"We MUST JOIN with Sauron !" One Ring ...ahem... One REAPER to RULE THEM ALL !
Oooh scary ! What a dark vision ending that will be !
I will take a different tact and suggest that the Reapers are uniquely vulnerable as they go about their harvesting. Yes they are incredibly formidable juggernauts, but they still hunger for something - and if they don't feed... perhaps they weaken. A planetfall landing means they are in atmosphere, subject to gravity, and CANNOT immediately warp away -they must leave atmosphere first...and it may be - that their orbital escape could be prevented with a strong enough attack.
The Mass Effect 1 and 2 story lines have allowed us to find potential allies who may be able to turn the tide. We can enlist allies who can attack the two halves of the Reaper physiology, both the organic and the tech sides. You know who I'm talking about !
Depending on the writers visions...yes the Earth will take much damage... but hey Biotic babies everywhere from Eezo exposure ! Maybe biotic dolphins and whales..and... well -we'll see how bad it gets. How bad it gets on Earth will also likely depend on how quickly we can rally the Milky Way Races to our side.
By the way... who says there won't be the technology to clean up Eezo spills hmmn ?
"Got Eezo dust in your room - from blasted Reaper bits ? Don't fret and tear the house apart Krogan Mama ! Try the Eezo Vacuum 7000 today ~ from Geth/Hanar Industries !"
It has been suggested already that the Reapers want to crush humanity - first - if they can.
They will move onto other races and the conflict will continue to spread. Some whole planets likely will be lost due to orbital bombardment. Still, I suspect the Reapers DO actually NEED to FEED - to replenish the organic parts of themselves - and when they land to feed - they become vulnerable again for a time. So each planet is another battlefield where the battle can be won - or lost.
Now for an inspirational quote...from the past...
"We have before us an ordeal of the most grievous kind. We have before us many, many long months of struggle and of suffering. You ask, what is our policy ?
I will say: It is to wage war, by sea, land, and air, with all our might and with all the strength that God can give us; to wage war against a monstrous tyranny never surpassed in the dark, lamentable catalogue of human crime. That is our policy. You ask, what is our aim ?
I can answer in one word: It is victory, victory at all costs, victory in spite of all terror, victory, however long and hard the road may be."
~ Winston Churchill ~ Speech to the House of Commons, June 4, 1940, during World War II.
http://en.wikipedia...._on_the_beaches