If this really is the case (and I'm highly skeptical), switching from 4096 bit to megabit or gigabit keys would buy us atleast a few years. But all previously

If this really is the case (and I'm highly skeptical), switching from 4096 bit to megabit or gigabit keys would buy us atleast a few years. But all previously encrypted messages would effectively become plain text to anyone with the foresight to save them.