You're absolutely right about turkeys not voting for Christmas, and my post was more in hope than expectation. That said, the conditions are presently better than they have ever been for effectuating such change, such is the general antipathy towards politics and politicians. I agree with your observations about the standard of our politicians, which is utterly woeful.
Maybe the Libdems time in government, rather than be a byword for political failure, could serve to demonstrate how different political parties, of greatly differing ideologies, can effectively work in government together.