No..
Steamboat Willie will be fair use soon, the only issue is that these exist:
https://youtube.com/watch?v=Q07QPHNz2pY
Disney has been reverting Mickey back to the old style. Not 100% sure about this, but the benefit to designing like this is that these count as new versions Disney can claim the rights to. Even if Steamboat Willie becomes public domain, the similarities between it and the new version can probably work in Disney's favor. Anyone who uses the old design could be struck in court for being too similar to the new.