Cosmologists and scientists in general will never put a gut theory together using the "big bang," as its overriding theory. I believe a half-dozen "armchair" physicists at the local bar could come up with better crap than current cosmology.
The true overriding concept is "which came first? the chicken or the egg?". This is because we are only one of many "emerging intelligences" in this galaxy alone. Life is prevalent throughout the universe; always has been; always will be. What we become is largely up to us. We are akin to plant seeds. Not all will find a suitable place to grow. Supernovas take life and spread life at the same time. It is no mystery. In the next decade, we should have the technology to see beyond the cosmic microwave background limit. It will require much larger and techno-savvy detector-telescopes.
The microwave and on down to radio-wave background will be resolved to produce images of more and more galaxies. I like the term "tired light". It hints at a complication that astronomers and astrophysicists have overlooked. Happy trails.