Here users from all over the world gather around to learn the latest about Chevereto and contribute with ideas to improve the software.
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I personally had to disable expirable downloads. Google Adsense started freaking out at the fact that I had 15k images disappear in six months.I don't think that end-users will like to upload images to a website that doesn't allow you to delete what you upload. I mean, I won't ever upload something to your website if you don't allow me the freedom of delete my own uploads.
Sometimes you have to think in the end-user and something like this sounds awesome to don't lose content, sure you will get less 404 errors but boy everybody will hate this stuff.
Way I see it, you will get permanent content but it will be drastically fewer than current situation. Having said that, I'm not sure if this should be added.