Earlier quoted context omitted.
There's also the potentially interesting idea of wallet-as-resume. IE allowing different types of access depending on what sorts of things you've done with your wallet in the past. Certainly not for all applications, but a certain level of implied competency might be appropriate in some cases.
"Service X preemptively bans me because I signed up for service Y with my wallet" sounds like the opposite of censorship resistance and decentralization.
For example, once a reasonable digital ID system exists, we can start to build trust systems, such that your good reputation among one community can be used to bootstrap your reputation in a new community. Again, zero-knowledge proofs should be a viable mechanism for conveying trust relationships without having to reveal your social graph.
Some of this data would have to be stored off-chain, or only in encrypted form on-chain, but I don't think there are any practical limits of blockchain technology which prevent this.