Just checked my copy, it looks fine. It probably didn't help matters that Lost Odyssey had its fourth disc shipped in a paper sleeve on top of the instruction manual:
View attachment 3045965
and the paper sleeve was too big for the case so they're all inevitably a little crumpled
From what I've read, disc rot tends to happen when discs are cheaply manufactured, and Sony's discs seem resistant to it, so I figure most Blu-rays will be fine for a long time. I haven't heard of any trouble with disc rot on PS1 games yet, and that's been kicking around since the end of '94. Meanwhile, a lot of HD-DVDs from specifically Warner are already rotting away, and I have a couple in my collection that show.
Apparently there are rotting problems with specifically MGS: The Twin Snakes on Gamecube too? But just that game?