@ErikJonker there is the #freeourfeeds initiative that will replicate an atproto relay. Subject to technical / economic factors it wil put to rest the (reasonable) fears about bluesky.
My gut feeling is that because of different architectures, the two protocols will give rise to different online exchanges. Bluesky type cathedrals vs #activitypub type community houses.
And much depends on the client software we use - which is a bit stagnant. We could have a common interface to all these.