or maybe all species will start getting sick and die one day because of microplastics contamination.

Some bacteria will survive.

I think the idea we have this highly dense energy source pervasively available across the earth in all biomes with an exposed surface area that is unfathomable, life will adapt to consume that source of carbon rich energy. I suspect we may be bringing the end of the age of plastics rapidly.

Is there any research being done on how our bodies are “hopefully” learning to adapt to this omnipresence of plastics everywhere in and around us?

People tend to care disproportionately about human life. We don’t actually know whether we’ll adapt at the pace required to overcome widespread plastic contamination (or really whether we even need to adapt).

Policy-by-platitude is a bad strategy.

Plastic gets consumed by oceanic microorganisms, though slowly. Take a look at the fascinating microscopic images of plastic partially eaten by microorganisms in this 2013 research article, "Life in the Plastisphere: Microbial Communities on Plastic Marine Debris":

http://onemoregeneration.org/wp-content/uploads/2012/07/Life...

Plastics also break down to simpler hydrocarbons and carbon dioxide with prolonged exposure to sunlight. Unfortunately, these gaseous small molecules are greenhouse gases, but they don't persist for as long.

"Production of methane and ethylene from plastic in the environment"

https://journals.plos.org/plosone/article?id=10.1371/journal...