1) First-come-first-serve for your first handful of domains. Price is nominal (e.g. $1/year).
2) Increasing price with number of domains held. If I hold myname.com, it's $1. If I hold a thousand domain, the last 500 are at $1000/year.
3) Oversight for transfers. If sold, resale value is capped. Historic domains shouldn't be used for spam but perhaps go to archive.org or similar entities.
4) Managed by a government institution or not-for-profit with open meetings, salary caps, public records requests, and other (legally-enforceable) checks-and-balances.
5) Several TLDs, but you can't register in all of them. You can have mybusiness.com or mybusiness.mobi, but not all of the above. If I have the same business name as you (Apple records v. Apple computer), I go to a different TLD.
6) Rules for new TLDs. You can't pull the Coursera.org "We're a not-for-profit" shtick. Old domains grandfathered in.
7) Oversight/governing board with members from the EFF, FSF, OSF, and so on.