The main barrier with NFTs as far as self regulation goes, is that there is already a massive body of regulation in place for art and copyright, which it is not really going to be 100% possible to escape. Even with self regulation there will be many cases where things go to court anyway. I do agree, though, the structures put in place by the successful platforms and communities will shape the future to some extent and do have the power to possibly reshape wider copyright etc.
We already have creative commons licensing and 'copyleft' etc. from the software world and I suspect that in most cases people will just use software as a template for NFT rights - coupled with existing multimedia ideas.
I have seen some platforms deliberately structuring their rules to completely let go of the old ways and try to embrace only a new way - it will be interesting to see how that works out, but so far they seem to be having limited success. We shall see!
The best way to predict the future is to create it!