Only if plastic consumption is bad for us. Sure it's bad for fish, I also knew a dog that loved to eat plastic, and it died, no idea if the 2 things are related (I'd need at least 200 puppies, as cute and adorable as you can make 'em....). But no studies have been carried out to test if people eating plastic is harmful, apparently largely because they can't find anyone who's not consuming it.
Sure it's very, very, very, very likely to be bad for us - but no studies say it is, cleanup and change will take ages and cost loads (maybe as much as oodles), and why bother if there is nothing to suggest consuming plastic is bad for us?
So nothing will happen, tomorrow (in a figurative not literal sense) it will all be forgotten about and eventually people will mutate into......either people who can safely consume plastic, or shambling disease ridden zombies, or possibly both. I'm sure there's a profit to be made either way, unless all that plastic has the same effect on us as it does on fish, in which case the only people making money will be fertility experts, at first, and then people selling lynching equipment, but how likely is that?
and.....it's actually a little unfair...I only switched over from table salt to sea salt recently and still have most of the box left and now the world's going to end
edit....it's remotely possible that we are all deficient in trace particles of plastic, and upping consumption will cure cancer, the common cold and cut the cost of home insurance. I mean it's not likely, but until some actually researches it...........