Apples to Oranges. Not even close to the same thing. If Physical Property were treated the same way as Intellectual Properties, no one would have any neighbors, because only the first person to build a house is allowed to own a house. Intellectual Property is all about who is allowed to replicate an existing work into additional instances of existence, where as Physical Property is all about not having your existential instance of a work taken from you.

IP should not expire as long as the intellectual product is not publicised, i.e. while it is in the head of whom produced it. But if it is publicised, i.e. published, it is public, and no longer property. If I had a house, that's physical property. If I and my family live in it, it's our property. If I let the public in, i.e. publicised it, then it is public, and essentially not property anymore.

Ideas and concepts have the ability to benefit society as a whole. Physical property benefits very few.

Also after a certain period of time, it becomes a bit of a stretch to suggest that nobody else would have thought of that same idea over a long enough time frame.

Now of course, I'm not really speaking to Mickey Mouse, so much as I am scientific breakthroughs and good ideas that improve on old concepts, but it's all IP.

Ideas are forever. Physical property is not.