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It does need a v2, but I think it's either very close to (or already past) the point where a v2 can be implemented without both killing the V1 and dooming the V2 to failure. If there is still time I also don't know how a v2 (several breaking changes) gets done, besides someone influential simply forking it and successfully marketing their fork.
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Protocol handshakes to establish versions is the easiest way and has been used for ages; every https connection you start to read this message performs a handshake.
Software implementations may be strict or non-strict about versions supported. It's not hard; just needs someone with experience to champion it.
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I've seen some proxy implementations but that just sits at the front-end (at least that's what it did when I looked at it). The real power would IMHO be in having a community federated relay - think for example an SN relay that only tracks SN users' known npubs and the surrounding events, and stores these. Can serve back via a read only relay.
SN provides NIP-05 services too so we know which relays to look at for the content of each npub...
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v2
at some point in the near future to get rid of inherent inefficiencies.