Any member being able to start a spill is a little extreme, but FS on the whole.
I'll modify what I said earlier. To have the leader elected solely by caucus under normal circumstances is a bad idea. Membership should get a say too. But caucus should definitely have a right to replace the leader if they feel it necessary, hence why the idea of spills is a good one. But use them sparingly. Replacing Hawke with Keating and Turnbull with Abbott were good ideas and absolutely necessary. What the Liberals did in the '80s and Lab in the past decade were horrible ideas. Is there a credible reason? Is there a credible challenger? Is the challenger a proven quantity who can outperform the incumbent? Only if all those conditions are fulfilled do you pull the trigger.