Originally Posted by barturtle
In wine that is intended to age in the bottle, the use of natural cork allows what best can be described as "controlled oxidation" that greatly improves the wine over extended periods of time.
However many wines that are considered "ready to drink" when bottled, do not benefit from the use af natual cork closures, and a few wineries are switching over to either plastic corks or screw caps (many Australians, are going the screw cap route)
Few types of plastic can't handle exposure to high proofs, after all several pure grain(190 proof) bottlings are packaged in plastic bottles.
The main problem I could see with switching to plastic corks, is the fact that they aren't going to have the nice soft release that a natural cork closure is going to have in a decanter style bottle. If you've ever opened a bottle of wine with a plastic cork you would notice how much tighter the seal is(requires a lot of extra force to remove), trying to use this in a stopper type opening seems like you'll be having a lot of corks breaking off of the stopper...not an unsolveable problem, but possibly one that could cause some problems early on.