Automatic upload of external images

Perhaps the idea seems banal, obvious or already planned, nonetheless.

Since the beginning of the era of Supergabra and up to the present, not from the good life, a common practice in writing articles with illustrations has been storing them on a hosting of images like http://imageshack.us or lecherstvo from original publications.

It is clear that sometime a few kind words like “onclick = '...'” will be added to the “insert image” button, but as time goes on, articles are being written. And after what time instead of the pictures yellow toads will appear - it is not known for sure.
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I suggest, as the hype subsides, to make automatic processing of already finished texts for downloading similar external images and changing their links to local ones.

UPD: Already after the publication I noticed a recommendation to refrain from writing articles with Habr discussion . Of course, I apologize for this, but I think that the proposal may be interesting for regular blogs, so I still want to leave it for everyone to see.