Due to common parreto distribution effects things will partly centralize. But the nostr benefit is that no matter how large a single client becomes, it doesn't lock anyone into that client. As something like facebook does. Renewed decentralization is always a possibility here!

btw. It's worthy to note that the head Amethyst developer nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z has been a great champion for people to use as many nostr clients as possible. I like how he pushed for promoting that concept of individual multi use of clients. It such a great idea :)