Electronic voting is a concept whose time should never come.
The first time polling results don't agree with the election returns, there will be no more confidence in the system. As bad as the hanging chad commotion was, you still had access to individual votes. There is also no compelling reason to institute it. It's not as though it takes weeks or days to tally results even for national elections.
People must have confidence that there votes are being correctly recorded and tabulated. As soon as that confidence is shot, we'll have chaos.