Until they fix captcha or allow Global Filters to become truly global, there will always be a risk of spambots. For someone who deals with these on a regular basis and has been doing it for years, making the Captcha system more friendly to users also means making it more 'friendly' to spam bot masters...the only alternative is to make captchas more trickier or harder....As i mentioned a few times on IRC, every 3rd account created on wikimedia is a spambot and thats just accounts, not taking into account the thousands of spam edits by IP's daily..