That will just centralize in the same large relays we have today as well. 

Also, the Outbox and Inbox relays should not be based on what your follows like. We can present a list to make it easier to type, but it's not about them. 

It's about where you do you want to store your own notes. 

In the extreme, each user should have their own personal relay in both Outbox and Inbox options.