I've started to see friend suggestions for Hubzilla folks in Zap. This is a result of some work I did yesterday. If all goes well it should work in both directions and Hubzilla folks will start to see Zap channels in suggestions - but it may take a day or two. There's also no reason why this couldn't work for all networks but it would take a little more development effort - one would need to check before making the suggestion query which networks or protocols you are able to connect with. The data is already there. Just throwing that out there in case anybody wants to scratch that itch.
Merging the directories is also on my list but this will be a little bit lot harder. I need to find a way to do this that doesn't show duplicates for all the Hubzilla folks, as anybody running 4.0 or later will have both zot and zot6 identities. This may be the first place where we convert completely to zot6 and leave behind anybody that hasn't upgraded. No matter how it's done, anything involving the directory takes a couple of months to see changes after the code is checked in so don't expect to see anything right away.