not all events are meant for broadcast (eg DMs)
replacing attention and users as the product model required the kind of mindset of bitcoiners and the use of LN
we have hardly even seen the beginning of closed groups, markets or DM usage of the protocol yet, it's way to premature to expect a failure at this point
shitcoiners aren't even here yet... believe me, they are coming, nostr is on the radar of numerous projects already