I'm primarily concerned about the "doesn't like animals" part...they shouldn't have a cat, or any pet, if they think they can make it conform to standards that are just not in the pet's nature.

I was once ignorant of the true story behind declawing. I think education is the key here, and you have done your part to see that these people are informed. Once I read what declawing really meant, I was truly horrified (although I never had a cat declawed - but knew of some who had)...and am now a staunch "soapbox preacher" about the ills of declawing. "How would you like it if someone cut your fingers off at the first knuckle?" (I know, a little too harsh perhaps)

While you can provide some "gentle guidance" to the cat's behavior, a cat is, first and foremost, a cat - and to a great extent I love my life with one primarily because I've learned to respect what makes her tick....(and occasionally ticked off)

If this is a friendship you cherish, perhaps you can lend your insight as a multi-cat co-tenant to help educate them....best wishes to you, them, AND to the potential pussycat!