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A big problem with making a change, is that there is no "right" length of copyright. Reasonable arguments can be made for all sorts of alternative arrangements, as well as for the current scheme. Forcing change from one arbitrary scheme to a different arbitrary scheme is naturally much more difficult than changing from something bad to something good.
In a worldwide economy, there is certainly something to be said for making them consistent between countries, and any changes would likely fly in the face of that.
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