Have you ever served on a jury? It's easy to get out of jury duty. The people who really don't want to be there, usually aren't. When I did grand jury, everyone wanted to be there and was very engaged. To me this is like saying people aren't interested in juicy gossip, having an opinion, debating the smallest details, and wielding power - that's not been my experience.
But the bigger problem is that, if the process were really so precarious, then that's exactly why we would want stronger controls. There may be a good argument for a different threshold but it isn't this one.