That would do massive harm to transparency due to making it harder to find anything. Not to mention the effective end of anonymous speech - either they host wrote or reuploaded it and either way they can be attacked for it. Which means vanishingly few would upload content from another.

Really the tear it down and build something new mentality is faulty. You don't tear your house down and then build a new one before you die of exposure, you build the new one then abandon or tear down the old one.