I've been playing through the Mass Effect trilogy again recently with the intention of getting 100% achievements on all of them. As part of this, I have got thinking about what I think would be cool for a new Mass Effect, so the obvious course of action was to let my fellow bombers know.
So here is my pitch, you play as a member of the alliance 15-20 years before the events of Mass Effect. This places you a bit after First Contact War but well before Shepard is running around. This game would see you as a commander who is tasked with the goal of pacifying a region in the Attican Traverse, the area of human colonisation right next to the terminus system. A warlord has been attacking every settlement in the area and the council won't do anything and the Earth navy hasn't yet been built up enough to project it's power out their. You need to build up your colony until you can find the warlord and kill/talk him.
It would see the colonisation working as sort of a combination of the "building" in assassins creed with the war score system in Mass Effect 3, you save a band of vigilantes on a planet, they come back to your base and start training people/fighting for you in a barracks which gives you 100 war score, and then you can upgrade the barracks to be larger/better, 200 war score and so on so forth.
All this would be in the background of you flying in your ship finding your crew, like you did in the trilogy and then doing missions to find the warlord. Then, when you back on your colony, your Liara replacement is hanging out at your university(space Indiana Jones maybe?), your Garus replacement is with your cops, your Mordin replacement is at your hospital and your Wrexs replacement is just blowing shit up.
What would you guys think if this was the next Mass Effect game?