The only thing that extending copyright past death + 5 years (max) does is protect an industry that actually creates produces nothing. Especially with distribution channels with nearly zero cost.
First - US copyright laws will keep extending the 'after death of creator' time so that The Mouse(tm) will NEVER enter public domain (unless the owners of That Damned Rodent are foolish or impoverished enough that they can no longer afford any Senators).
The SOPA/PIPA laws were never designed to insure that artists and creators are justly compensated... just look at who is bankrolling them: the mass media distribution companies that have made a science out of cheating artists and creators out of the profits.
SOPA/PIPA is an attempt to head off the disintermediation that threatens to allow us to buy our music, movies and books directly from the creators, or via more efficient channels where the cost of product more accurately reflects the distribution plus royalties cost, and minus the many, many lawyers, accountants and various suits that are part of the overhead of the old media empires.
I cannot blame the parasitic classes in Old Tyme Big Media from trying to hold on to their slice of the pie (actually, most of the damned pie, leaving a few crumbs for most artists), as who wants to voluntarily jump off the gravy train?
(is that enough mixed metaphors?)
Now for the mandatory car analogy -
If a Hundred and Ten Years Ago the Farriers, Harness-makers, Wainwrights and Others in the Horse and Buggy industry had asked Congress to make it a crime to allow anyone to use a "Horseless Carriage' on the public roads, and that any town that contained a Horseless Carriage be cut off from the public road networks.
Hows that for an analogy?