The point of copyright is to get works into the public domain by allowing creators to recoup the costs of production and make a little bit of profit, the point is not to allow an endless revenue stream from something that is public domain.
If anything works that create more revenue should have their terms expire faster.
I also support continuously raising the price necessary to renew the copyright as you try to carry it longer and longer. And again, I'm not trying to hurt the mighty Disney corporation; sums they'd laugh at would still be sufficient to open the bulk of the content back up to us, and that's what I care about.
To make my point clear, this is entirely practical. In theory, should Steamboat Willie be public domain by now? Yeah, sure, there's no really good argument based on the public interest otherwise. But as a practical matter, if we could distinguish between Big Copyright's interests and the vastly larger "everything else", we'd be much more likely to come to a compromise that leaves everybody reasonably satisfied, if not ecstatic.
Now, extension of trademark, that I get to a limited degree. They can be the sole Mickey maker for a while. But why should they not have to make new material to generate new income from it?
Say you wrote an open source software package in 2004. Should Microsoft be able to take your work and incorporate it into a proprietary package, just because 7 years passed?
No, you don't get to own an idea forever just because you thought of it first. The very concept of 'owning ideas' is silly, but even if it wasn't, the second you tell it to someone else, it becomes part of the collective society and culture. If you don't like the deal that copyright gives you, you have a choice: don't share the idea at all. And that's fine, and I'm sure that the world would have kept spinning if nobody ever drew up MickeyMouse.
And I don't actually program anymore, so let's go with writing: should anyone have the ability to republish it without my consent after the copyright has ended? Yes. Even a big publisher.
Should anyone have the ability to take my created work and extend on it, using my creations outside of the created work? Yes, after the trademark ends.
I'm sure John Yoo could find something in the Constitution to allow it.