G.O.W 3 Aftermath

Its been almost a month now since gears3 was released in september, and that has given the majority of gamers an oppertunity to play throught the story alone or with friends, so with the queen dead and the locust seeming defeted whats left for marcus and the rest of the humans on sierra, these are all questions that epic clearly stayed away from at the end of gears3 for whatever reasons they had to not truly end the story but here are the thoughts that I have had and im sure most gears fanatics share some of the same questions

1. What will humanity do now?
With 99% of humanity dead, a destroyed planet low on resources and the main source of fuel proven to be a deadly virus how can humanity possibly continue life of sierra? Even if the locust & lambent are all dead (which we dont really know) how can this be called a "victory" for humanity and even if it is where does the human race go from here? It seems highly unlikely that humans can continue life on sierra with any level of success with the planet left completly barren.

2. What is stopping the lambent from returning
From what was explained the lambent came from immulsion, the gears version of fossil fuels on sierra, and somehow they came from it and caused the mass infection of the locust and humans, it is not explained if the immusion is used up or distroyed but assuming it isint all gone what is stopping the lambent from returning?

3. Why didnt humanity leave sierra?
Gridlocked in a nasty war that has seen 99% of the species murdered for a cause largely unknown why didnt it dawn on prescott and the government to leave sierra and venture to other planets with the rise of the locust army?
What was so precious including immulsion (which was the tipping point in this extreamly heinous war) that was worth the potential death of the species?

These are the big questions i have in the aftermath of gears3, hopefully in some form or another they will be answered, in the mean time I would love to hear from all of you on what you think went down after gears3 and whats to come for the franchise...