I think it'll be fine actually. The ending of heresy had to happen and now we have two different enemies with some lore and ties. Savathun is now our enemy once again and Xivu can get her own dlc/chapters if they build her up correctly. The new threat which is probably a nine member will probably be introduced and built up slowly as they gain power. The other members are now potentially 4/4 or who knows of the 9th was on one side more than the other. Bungie has to cook and heresy did things the right way except for the voice acting sag thing. I'm ready for this delicious meal.