1) is the slang word used a lot? Where are you from, roughly (e.g. UK, Australia etc.)
Here in South
Africa it's used pretty routinely by English-speakers
2) is it still used a name at all where you live?
No
3) do you think it is usable?
I certainly hope not; I do like
Frances, and all the
Frances people I've ever known have either been
Frances or used
Fran as a nn
4) do you like it or do you think you would like it if the word didn't exist?
I find it a bit bland and uninteresting, like
Annie instead of Ann/e
5) does it have any chance to become usable again in the future (if you don't think it's usable now?)
Not really. Realistically, however mature and liberated people may become, they are still likely to want to neutralise the power of their own and other people's sexuality, sexual organs, defecatory regions ... and for that, a slang name to giggle over is useful.