To promote the Progress of Science and useful Arts, by securing for limited Times to Authors ...

[Sam3]

Unless you get the populace to teabag, carpetbag or otherbag, i.e. get riled up about it, then nothing will happen. The opposite will happen, Disney will throw lots of money in the direction of policymakers and ask for a copyright extension when Steamboat Willie comes up for public domain inclusion, and they will essentially be granted a perpetual copyright. Say goodbye to the public domain as we know it.