Not really a problem anymore since they switched glue's,nothing will last forever but people said the same crap about vinyl in the 70's and look how that turned out,if people can keep a 60 year old comic book in perfect condition people can keep these for 30+ years easy.
The first DVDs released used horrible glue's made in mexico that would split the disc from the front to the back and would make ur disc look cloudy then would just not work,I owned a few that was starting to rot but if you have a bought a disc after 2002 or 2003 you should not have any worrys.
I own CDs from the late 80's that are still flawless but CDs are a little less sensitive then DVD's.
Blue rays are harder to keep mint so you have to be more careful with those for sure but those will last 50 years or more.
What is the purpose of this topic anyways...? Am I supposed to get rid of all my discs in favor of cartridges, digital-downloads...or what ?
I take care of my things, so I bet my games will be good for another 40 years.
BTW I still have PS1 & 3DO discs that are in near mint condition. And they are already near 15 - 20 years old.
So the only people that should be worried are those that treat their things like crap...which in that case is their own fault, and NOT the fault of the media.
Oh yeah, another BTW.... Cartridges can corrode (because they have metal parts)....discs CAN'T. So put that in your pipe & smoke it.
Technically disc foil is metal, and can corrode, especially if you drop some kind of liquid on it and never properly clean it. That's why those super-cheap CD-R's without the protective paint coat are NOT a good idea. --- "Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." Ben Franklin