Hypothetical: IBM decides to get back into the PC business, for whatever reason. Their lawyers pour over their contract with Lenovo, until they find a loophole, a trademark that they forgot to transfer.
Now that you mention it, they're pretty well positioned to make a compelling alternative to the nightmare that are is Windows while giving the Appleverse some competition too.
Imagine a BlueBox running RedHat. Built like tanks, which is in their wheel house, and competes with Apple. Great kernel support for all the carefully curated hardware...
Maybe open GPFS while they're at it.
Maybe the year of the Linux desktop really could be more than a meme.