We're not talking to our kids, are we causing speech delay?

As a parent and educator I encourage teachers to integrate technology in learning at schools. I have done a number of large studies in the area, and studies show educational programs on computers and other devices have great potential to improve early learning. But primary school principals and early years' teachers have expressed concern to me about the increased numbers of kindergarten students with obvious speech delays" so much so that in many schools speech therapists have been called in. Are parents relying on technological devices to entertain their children" known as "pass 'n' play"" rather than direct conversation, story reading, playing games and make-believe, and other forms of quality interaction?