Maybe but as a core nostr person followers are more likely to go thru the effort. I am a humble nondescript pleb; wouldn't expect my followers to notice the request to change, or to cut over. i'm hanging on to my 32-bit PoW key until there is an auto-transition mech in clients
 

 I don’t know enough about the method, but is there a chance a duplicate key could be generated and used by someone else while you’re holding onto it?  Seems astronomically unlikely but something I’ve wondered. 

 astronomically unlikely is an apt descriptor but its probability is overestimated because humans are bad at extreme scales. functionally: no, never