> Cut copyright to 15-20 years by default.

This alone will kill off all chances of that ever passing.

Like, I fully agree with your proposal... but I don't think it's feasible. There are a lot of media IPs/franchises that are very, very old but still generate insane amounts of money to this day with active developments. Star Wars and Star Trek obviously, but also stuff like the MCU or Avatar is on its best way to two decades of runtime, Iron Man 1 was released in 2008, or Harry Potter which is almost 30 years old. That's dozens of billions of dollars in cumulative income, and most of that is owned by Disney.

Look what it took to finally get even the earliest Disney movies to enter the public domain, and that was stuff from before World War 2 that was so bitterly fought over.

In order to reform copyright... we first have to use anti-trust to break up the large media conglomerates. And it's not just Disney either. Warner, Sony, Comcast and Paramount also hold ridiculous amounts of IP, Amazon entered the fray as well with acquiring MGM (mostly famous for James Bond), and Lionsgate holds the rights for a bunch of smaller but still well-known IPs (Twilight, Hunger Games).

And that's just the movie stuff. Music is just as bad, although at least there thanks to radio stations being a thing, there are licensing agreements and established traditions for remixes, covers, tribute bands and other forms of IP re-use by third parties.