I don't think referral systems would work in football. It would simply kill the flow of the game, I think Platini doesn't want to use technology because then he'd have to create the boundaries of what/what can not be referred. I think if technology was to come in it should be at a referee's discretion. They all wear ear pieces now so he can simply ask the question through the mic, but again boundaries should be guidelined for them. As it is, the role of 4th official is still disputed. Last season in La Liga there was an incident (forgot the match) where the defender fell in the area whilst defending, then handled the ball away on purpose. The referee missed it, but the 4th official brought it up and the defender was subsequently & rightfully sent off. The point to that is, there was a huge appeal launched by the other team, their defence being the 4th official is not allowed to interfere in play like that. With the same point, the rules using technology would have to be so clear cut that no conflict could arise. And frankly I think it would cause more controversy/complaints than it would bring "fair play" in.