This is great news. I think if widely well-implemented in relays and clients the gossip model can fix some fundamental issues in nostr that would eventually (under higher adoption) become show-stoppers.

If nostr's functioning becomes critically dependent on some low number of popular relays (which is arguably the case already), it loses its single most important characteristic: DECENTRALIZATION. And those popular relays inevitably become targets of all kinds of interference (hacks, DDOS's, court orders, etc, etc, etc).

If nostr is going to work as a large-scale social media platform (there are plenty of other use-cases that don't depend on this), there have to be LOTS of independent, commodity relays all over the place that are fairly dumb and follow a relatively simple set of common rules.