There was some fresh discussion on this topic recently. See https://irclog.perlgeek.de/perl6-dev/2017-10-11#i_15289848 and the start of the discussion on https://irclog.perlgeek.de/perl6-dev/2017-10-11#i_15289680
The idea is that instead of doing a full migration we can just start using another tracker in parallel, and then we'll see how it goes.
