Really a captcha system would be the only way to stop botters since the Devs make it look just as if a player did the attack. Not sure they'll do this though because I'd imagine this would be annoying/irritate a lot more people then just botters.
I guess we'll have to see though.
Anyway it seems so strange that Supercell admits publicly that there are bots and cheaters in the game. Adding the fix in the patch notes and not doing it secretly its very weird in my opinion.
P.S. They deleted a post of some people asking if there really was a bot for clash of clans