You'd also want to store a few CD drives with them. And a few computers to attach the CD drives to. And from there the problem arises. Both bearings and electrolytic capacitors are essential for computers and I doubt that they'd last 50 years.
Even if it didn't, if you compare the costs of many other storage techniques, they're probably equivalent to jerry-rigging a CD player to read back these disks. The difference is the cost is shifted to the reading and not the storage.
Your main risk is the shonky assumptions of the "archival" CD manufacturer. Not that I know what those shonky assumptions are, but I have a vivid memory of the hosts of Tomorrow's World demonstrating the durability of CDs by spreading jam on one, then wiping it off.
Also I'd claim that your 286 has higher build quality and it's less sensitive than modern computers.