[Nasrudith]

Well it should be self-correcting in itself if there is no rogue plastic lying around to be consumed they will die off.

Although there may be an issue with diversity and horizontal gene transfer - I am uncertain what impact that will actually have - especially given how fast bacteria adapt in the first place in proper conditions.

[senectus1]

so there will be no sudden explosion in the organisms that eat this bacteria?

Also no chance that it will evolve sideways to decide it likes to eat other things?

I hope they keep it contained. After other notorious attempts to do things like this (aka cane-toads in Queensland Australia etc) I dont like to think of what happens with something nearly invisible as bacteria and as wide spread as plastic...