Lot of ground to cover.
Wish they had gone with the book Stannis plot, where he had his garrison left at Dragonstone mining dragonglass as soon as he learned of the threat after going north, thus putting a lot more dragonglass into the game for the final battles. They have to outfit all of the soldiers with dragonglass for there to actually be any battles rather than just a bunch of slaughters if the story is to make sense going forward. As is, after the exhibit, I wouldn't send Lannisters to the front lines without effective weapons either. I guess Cersei does have a bunch of wildfire and a hand that certainly knows how to use it.
Cersei/Lannister is also just one of many strong families in the south that need to be appealed to IMO. That dragonpit meeting should have been a great council where all of the remaining powerful houses were invited. As is, there is no clarity where the power Dorne, the Reach, and the Stormlands will be in all of this, and there is a large enough fighting force in those places by GRRM numbers to match the number inside the wight army almost 1-1. There is no clarity on the Lannisters either, given the split, and that the leaks had her miscarrying in one of the final scenes of the season, which might change her mind on which path she should take going forward, but it was obviously not included in the season.