As a great opponent of any form of IP, I have been following the event of Disney's Steamboat Willie entering the public domain with great amusement. The incidents where creators have been falsely demonetized on youtube for rightfully using this film is further underpinned by Disney's decades-long shameless practices. The linked article sums it up quite well I think.
Copyright is only an incentive to create new works for the public. For us. Once you've sold it, it's ours. That's what the money is for. If thirty years isn't enough then it's just not gonna happen.
People have a right to culture. Anything you grew up with is yours to build on.