Cooperation on kashrus has proven to be an achdus driving force. The same could be said of a yichus registry, once kehilos can come up with a system wherein all parts of the kehilos are represented. I don’t see it happening anytime soon though.
Having individual cities run their own yichus logs sounds a lot more doable to me. If they could do it in Europe without computers, I’m sure it can be done easily nowadays.