Nashiktal wrote...
For all we know, after this is over humanity won't be able to maintain its power anymore.
That's possible and if all indications are that the war will end this way, then we should join with the Reapers.
You see, after the war Reaper tech will proliferate throughout the galaxy as each species works to reverse engineer it. Species which more capital and brilliant minds to devote to it will master it before any species lacking.
If most of humanity dies on Earth, collapsing much of our economy, then we will be at a disadvantage when it comes to reverse engineering Reaper tech. The other races will achieve it first and in time they will adapt it to themselves... changing beyond recognition. They'll have reached technological singularity. The consequences of that are limitless, but it will surely involve them becoming much stronger than we are and possibly involve them enveloping us in their own growth. We may be wiped out completely.
If we join with the Reapers though we'll continue on in a new form or forms and remain a sovereign nation unto ourselves. It is not an ideal existence as we will have forced to undgo this transformation by an alien power, but it is the best we can do given the circumstances.
However it may never come to this. If we can defeat the Reapers and save Earth we may very well emerge from this conflict not much weaker than when we went in. The other races will have been hit hard too, maybe harder, depending on how well we play our cards during the war. If we can hold onto the Citadel and mitigate the damage done to the Earth we'll be alright.
We then pull the others towards us by ensuring our rivals fall into disorder (namely the turians) and we'll have emerged stronger from the whole ordeal.