They have already stated that system is not coming back, so the best you can hope for is the ensure that there will be a better balance between the tiers. As there won’t be all the systems BFA has, it should be easier for them to create a balance between the two system to allow top tier players from both to have access to gear of similar power.
Now they could make PvP sets with bonuses that are designed for either, that would be a nice change!