Thinking about Webfinger

Back in 2012 Mark Nottingham suggested a way to lookup JSON data for a
given handle:

/.well-known/user=bob@host

WIth the endpoint returning JSON

In retrospect this was a brilliant idea.  What happened with webfinger was
a bit different

instead of user= or acct= a new URI scheme ws minted acct:

This was unnecessary, and there wasnt a good reason for it at the time that
i can remember other than to use uris.

Also at the time the JSON that came back was JRD, a whole new flavour of
JSON modele on XRD.  However, XRD failed to gain popularity, and JRD is a
different format to most of the fediverse.

Would it be time to simplify webfiger in 3 ways.

1. no longer need the acct: URI scheme
2. use the simpler acct=user@host form
3. return a JSON serialization that is the same format as AP objects

The existing infrastructure would need to be maintained because its used in
places such as OIDC, however a newer endpoint could be advertised for newer
systems, opting in.  Perhaps even could be proposed to the IETF as
Webfinger 2.

Is this too big a leap, or worth writing up?