I understand where you're coming from Tom. I'd like to think any changes like this are like a piece of the Newgrounds soul going into cold sleep for awhile til it's safe again. This place holds a ton of memories for me. So I'm glad you're trying to preserve the older content.
Still, there has to be a better way or some loophole that can be exploited. I've always been of the opinion that if someone isn't making money off something there's no legal matter to speak of. Of all the portal submissions with fan made music videos the comments are either about the animation or in support of the original artist. If anything it helps spread the music and make it known.
I'm not asking you to stick your neck out for a bunch of anonymous internet users, But I hope we as a group can figure something out eventually.