The ICC has already trialed lbw lines, and didnt like them very much, but they are investigating more technology and other ideas. For example, in the super series, umpires will be able to ask the 3rd umpires opinion on any decision, including lbws. I'm conducting research regarding these issues, and if you'd like to take part or find out more about these idea, please visit:
http://www.datawise-systems.co.uk/survey Thanks for your time!