Unfortunately, the problem with participative democracy, as opposed to representative democracy, is that it presumes the people a) know enough about the issues, b) care enough about the issues and c)are prepared to participate in the entire political process to a level that they are certainly not doing now. Now, it is possible, as some argue, that the reason people do not involve themselves in politics is that they feel their voice does not count, and that a participatory system would revitalise the electorate, but personally I doubt this. Even if they did, what guarantee would you have that the right decisions, as opposed to ones that simply reflect self-interest, would ever be made? Check your own tagline!
The fact is that democracies, even those with inbuilt constitutional absolutes like the US, are dependent on citizens taking an active part. This should not surprise. How can government "of the people, for the people, by the people" work if the people concerned do not participate?