There is no need to change something that is already working perfectly well. If freebitcoin really wanted to and thought it was worthwhile, its team would have changed the current site design to a more modern one years ago. By the way, what kind of audience do you mean by "micro earners"? Are those users who still use the freebitcoin site as a faucet? If so, I think such users are no longer or almost not left.
Faucet users still exist in my opinion, but hunting that faucet rolls as compared to playing seems like a "nah" moment to me in today's average faucet dispense value. Most of the faucets out side have left the scene owning to costs and spammers cheating on the faucet, but this one survived because their main source of income was changed from ads to the casino on board.
Indeed the owner is very flexible about how the site should run and that is the backbone of smooth running of this site.
Yeah, I myself go use the faucet like few times everyday, or ones a day depending on how busy or less busy I am for each and everyday.
And speaking of the death of other faucets around and FreeBitco being seeming to be the only one that is still standing even up until now, I would say that this actually is a great achievement for the site and it's owners, but let's also understand that, without the faucet, FreeBitco might completely lose its essence of existence, which as it implies in the name or title of the site, a means through with people can earn Bitcoin for free, so, this is why I believe that faucet might keep running for a very long time from now, as long as the site owners continues to see the faucet as the backbone of the FreeBitco site and it's growth, I possibly wouldn't have know about FreeBitco if not for the faucet to earn free bitcoin.