If they were interested they would follow up. if they haven't followed up they either have found someone or are Richards but, either way, to me it speaks volumes about how they would be as a band member.
I had a similar thing - responded to a 'bass player wanted for blues/rock band' advert - filled in a lot of personal detail, put in links to various decent quality live clips I was able to dig out (they were even of me, too!). Didn't hear a dicky bird back. Not even to say 'sorry, you are not who we are looking for/clearly delusional/we have already found someone' or whatever. Just count it as a lucky escape.