What he's talking about is someone reacting to
this post of loftar's about some sort of arcane hibbedy jibbedy that evidently turns maps into fancy parchment you can't write on.
I don't know if this is a regular thing or not, but after confirming some of my maps weren't loading properly I just trashed the whole bag (well, cupboard) since they're already saved as screenshots anyway.
To address the original question, I think if you keep on
viewing the thing regularly you're safe in any case. Whether it'll poof or not if you just leave it languishing around in a cupboard, I don't actually know.