Let me reiterate: There's a very interesting nugget in there. Namely one (possibly of many) ways for ordinary citizens to provide less asymmetric incentives to politicians and bureaucrats.
I'm really interested in alternative methods of achieving similar goals. Rather than death, could we perhaps institute a petition-based vote of no confidence that could be binding? I'm not sure how that would work but it would be a way to kick someone out of office or position sooner than a term limit and which would also be tremendously damaging to their reputation; something which seems rather important to politicians. Maybe you've got other ideas?
EDIT: To answer your question specifically the goal of a marketplace is similar to voting but one which isn't necessarily scheduled the way voting is. For example the guy after Obama could win by a 90% landslide, then immediately launch an all-out war against Iran, Syria and say Jordan. That might quickly turn the tide from 90% in favor to 80% against, but we'd have to wait at least 2 years to vote out a lot of people in the House, and four full years to vote the new President out, and a total of six years to get rid of people in the Senate.
Given that it's not terribly easy to make a living in the US and that many people have jobs, kids, elderly parents, etc. to prevent a sizable fraction of those opposed to various things from making a serious public statement like a march on Washington, lowering the barrier to entry MIGHT get us better outcomes.