That was where it seemed your original comment was heading towards. That the creation didn't matter. I think we agree here but we seem to have missed each other's points.
1b) Hold on, are you arguing that copyright shouldn't exist because music/art has always existed in some form or another and therefore it doesn't deserve to be protected?
1c) Actually, copyright helps to boost creativity in some cases. See point (2b).
2a) UK copyright law actually started as a way of enforcing censorship. Mind you, this was hundreds of years ago under the Statute of Anne. These days, however, its job is to protect the rights and welfare of creators. Because our society places an inherent value on the work musicians do - whether they be pro or hobbyist.
2b) Copyright means that someone can't just go onto soundcloud, copy one of my tracks and call it their own. And a damn great thing that is. They'd be ripping off my work. Why would I bother creating anymore music to share with people if all that will happen is that is gets ripped off every time?
Yeah, I put the music out there for people to enjoy, but if someone else is going out and claim it as theirs and get some big concerts off the back of it, why would I bother? Humans are not altruistic beings. We are inherently selfish. Laws help keep us in line. That's the point of laws!
So, in that way, copyright actually helps boost creativity, whilst balancing the rights of the consumers and the rights holders.
3) You've taken the existing models used by collection societies and wrapped them up as if they've new. Also, its not clear if you're talking about just trying to use samples, or copyright as a whole. I'm going with the latter, as you mention remixes towards the end of your post, but if it's the former feel free to call me out and i can come back with other stuff then.
Let's go through these ideas in order... Using Average Joe, the dope smoking guitarist from The Average Band, as an example musician.
3a) mandatory fixed-price licensing (pick a price per human end user, but you cannot say no to remixes or alter the price for anyone);
PRS requires people who use music to have a license. The BBC pays a license fee. Pubs pay a license fee. Radio stations pay a license fee.
The price per end-user fluctuates because the number of end-listeners fluctuates over the course of a year. Also, the majority of revenue domains (Live especially) can't estimate how many end-listeners were actually listening to each piece of music. This is why blanket deals happen. The data just doesn't exist.
And before you start thinking "YouTube must surely be able to provide that data", their data was some of the most useless stuff we had to deal with back on the 2014 license. Seriously, it was atrocious.
All your solution does is put the onus of understanding the licenses on the rights holders, like Average Joe. Average Joe sometimes forgets what an A Minor chord is, let alone the choices between legal frameworks.
3b) citation-based subsidy
PRS receives usage data from licensees and then pays out to rights holders based on that usage. So nothing new here.
3c) mandatory auctioning (e.g. the copyright owner sets a price, pays X% of that price as a tax, but must sell to the highest bidder over that price, potentially annually at increasing scale?)
So only one entity ever can have access to The Average Band's brilliant new album: The Average Album?
3d) I'm positive thee are dozens of other (better) systems too, I just thought of those on a whim
If you've thought of these on a whim then I can almost guarantee that they will not work. In all my time at PRS, the "blue sky thinking" ideas were always the ones that resulted in members and/or Joe public getting angry at us over the phone.
There is not one single specific model that works best. There are different models because they fit the purposes for which the music is used best. The system is complicated and there is not a one-size-fits all solution...
The model that exists now actually pays rights holders pretty fairly, and is tried and tested over a number of years.
4) So the opportunities for "Remixes" are a bit of an issue in copyright at the minute, yes. WIPO put out a report mentioning the issue in 2015 and the potential need for reform. But you seem to be basing your position the idea that all rights holders will deny the use of a sample. Which just isn't true. 90% of the time they just want to be remunerated for the sample's use. Then of course comes the degree of the renumeration, which requires some negotiation. But I manage to make music and use samples perfectly legally. Why can't others?
5) How do you think Joe Average is going to fare when he has to learn about Boltzmann constants just to work out whether he can use a sample or not?
6) I noticed you didn't respond to my point about losing out on all my investment over the last 10 years. Any particular reason?