The argument to retain these mythical profiles was always that if they were merged away someone would come along and recreate them. Now that there are more limitations on the creating and editing of pre-1500 profiles, the chance of that happening seems less likely. Perhaps eventually when all the current changes are more bedded down, other options for what to do with these profiles can be discussed.
I've often considered whether these mythical profiles should belong in the EuroAristo project and for the moment I think they should until something else can be arranged. It's a bit nonsensical, but I've been putting the template at the bottom of the biography section if they're mythical.