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Things don't change by voting though, certainly not only by voting. Voting is a pretty weak action.
The Ghurkas weren't allowed to stay because of voting, women didn't get the vote because of voting, the delay in increasing petrol duty was not caused by voting - it was all down to actions other than voting.
It is truer to say that things will _never_ change rather than only change if we keep voting for the dominant political forces.
I'm not campaigning for everyone not to vote in the expectation that that could happen, I'm questioning why people vote for parties they don't actively want, and whether those who don't vote are the lazy ones or whether it's more lazy to merely vote to keep out Dumbest and be otherwise inactive.
I find it irritating that so many people vote in this way and then the dominant parties can claim to have higher levels of support, albeit even then it's pretty low. 21% of the electorate voted Labour at the last election I think (about a third of the two thirds that voted roughly) but what proportion actually actively wanted a Labour government and weren't just voting out of fear of a Conservative government? 10%? 5%? It must be pretty low, and yet that was seen as quite a big victory wasn't it?
I doubt my system would ever be implemented by a party putting it on their manifesto, because the dominant parties would never do it as they've too much to lose, and the others wouldn't get enough votes because too many people would vote for one or other of the dominant two to keep out the other one.
I think there is more chance of it being implemented if voter turnout continues to decline, but the thing that would make it most likely is if there was a public appetite for it, which I don't think there is yet.