I don't think you'd have your collection in danger by wrapping the items in bubble wrap for a prolonged amount of time. That being said, you can't really be 100% sure that there wouldn't be any issues.
Like the issue with comic books degrading in their plastic sleeves, it would all come down to a mixture of factors between conditions and components. For example, the comic book situation could be attributed to a whole bunch of things, like moisture getting into the sleeve and not having a chance to evaporate because it's sealed in plastic.
The same could possibly be said for TFs. Depending on how era expanding your collection is, you'd have alot of differences in plastic and paint quality between G1 stuff and Generations stuff. Paints and plastic from the 80's have a much different composition than they do now, and you could find that some aspects of some figures could be affected.
Now I'm not trying to freak you out, and have you rush to unwrap everything, there are just small chances that SOME things might be affected, even just a tiny bit.
Just don't wrap them in Newsprint........... Horrible idea
