I'd be concerned about household plastic products degrading over time. Would an original Atari still be in any fit shape today if such bacteria or fungi had been around?
We fight mold and termites now in our living spaces, imagine if you had a plastic-eating organism and a little bit took up residence in a hotel, an office, your car, a bus or train, your house.
Even if it was relatively slow at breaking down it could cause considerable cosmetic damage. A little gets on your laptop display. You leave it at home and go on vacation for a week, you come back and some light etching has occurred over streaks of your monitor and the screen is now fogged and needs replaced, you wipe the exterior down as best as you can before replacing the screen and are pretty sure you got it all. Your screen gets replaced, your laptop works great again until a month later you pick it up and your spacebar falls off, the plastic switch entirely degraded, you open up the laptop only to find most of the internal plastic is structurally compromised, you unknowingly transferred some of the organism inside when you replaced your screen.
Here in Indiana, sometimes in the spring and summer, there's this fungus called 'lawn rust' that has orange spores that resemble rust and get on your lawn and will even get on vehicles (which will just wash off) but imagine something getting in the wild and landing on your car with a largely plastic body... go a week or a month without washing your car and you might get home from the car wash one day and notice your bumpers are pitted, oh darn the future plastic eating bacteria/fungi strikes again.
Even if only kept this stuff in industrial facilities, unless you go NASA level clean-room when leaving the facility it'd be damn easy for some to hitch a ride on someone headed home from work and, well, "life will find a way".
I don't think it would be that big a deal. For the longest time things were built with leather and wood instead of rubber/plastic and society survived just fine.
I think a lot of people are over-reacting to the idea of plastic rotting because they live in the Southern California filter bubble where nothing rots or rusts (because it's basically a desert) and so the idea that one wouldn't just be able to leave materials outside and expect them to be just fine is foreign to them. Having materials naturally degrade over time is just a fact of life everywhere else on the planet.
Probably not, we'd probably end up making single use water bottles out of a material that miraculous.
These discussions on the internet so rarely bring any true insight to most topics, but the few nuggets that are rarely found sure make looking for it pretty addictive.
Quite a bit worse than a bit of injection molded plastic.
OP was worried his atari would have disintegrated by now if it had been made 40 years ago out of biodegradable plastic.
I was giving wood as an example of why it might not.