I like the idea of supplements to codices. Books that give special rules to make genestealer cults, rules for other hive fleets, eldar craftworlds, renegade guard, etc. Something just like the supplements from a few editions ago. it would be very easy, it could even be put into Chapter Approved in White Dwarf and I think a lot of people would be happy. It wouldn't take the full playtesting and R&D to make a full new codex, but it would give people a lot more variation on what they have now.
And instead of making 12 supplements, and 10 of them being imperial, make one for each codex before making a second.
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