So...The electorate have decided, but over the coming months, as experience builds or new information comes to light, people become convinced that the decision was wrong or that there could have been a better solution. What would trigger a new vote on the issue?
Interactive Democracy would allow new suggestions, or even the re-submission of old suggestions, that may gain increasing amounts of support and force Parliament to look at the issue again. But there may also be another way: individuals may be able to change their minds after the vote was cast and declare that they had made a mistake, switching to another choice on the ballot 'paper' (web site). This wouldn't have an immediate effect, but once the majority has shifted to a different solution it would trigger Parliament to review the situation and ultimately to call a new referendum.
Is this becoming too complicated? I don't know, but it would be a simple thing to set up in the original design of the ID service, at little extra cost, and may some day be a useful tool within the democratic framework.