At this point in technology only an idiot would use SSD for permanent storage. They are designed to be a form of cache.
Technology will probably advance and soon they will be reliable for ever increasing periods of time.
PS. Only idiots believe the marketing hype of certain vendors.
Well, to be fair, even optical disks (CD/DVD/BR) degrade over time, and bitrot can be a problem on many forms of medium.
Even BIOS chips can suffer from it although they are manufactured to be quite resilient to it as I was reminded not too long ago.