future call centre execs!

hey! go to www.sitepal.com
it has virtual characters containing artificial intelligence for your site.I was wondering whether we could replace humans with such characters in situations like call centres where there is tremendous potential and scope. Unlike humans ,they can work 24-7 and won't demand any graveyard allowance too!! Speech recognition and programming can achieve that.And once it happens, its going to be a revolution as quite a lot is being spent on services like these and quite a lot of users are unhappy with the quality of service being delivered by humans.Marketing can take a whole new dimension and that implies bloated bottomlines too! what say??
still wondering whether AI is in vogue or not??