I think small, niche, community relays and small special use case relays will be the backbone of the decentralization. For this, relay software has to get a lot easier for anyone to run with with very little technical expertise.
nostr:nprofile1qqs8sxs4yuz47axp7uprpugrs3sfkdz5379tdg9xe2n5qfvz070a4egprdmhxue69uhkwmr9v9ek7mnpw3hhytnyv4mz7un9d3shjqg4waehxw309aex2mrp0yhx6mmnw3ezuur4vgzaq60d is good for this