Even if this happens, which I highly doubt, Dany will still have 2 bloodthirsty powerful houses with legit armies that are ready to fight for her.... and THREE fucking Dragons (No way in hell they kill any of those Dragons in a storm). That is still plenty enough to get shit done in the south.
nah, man... this shit is a wrap before it even gets started. Dany has waited all her life for this moment and watch it all be a bore to her.
I mean damn, forget the armies for a second, look at the MINDS she's surrounded with:
Lady Olenna
Tyrion Lannister
Varys
God tier intellect in the GoT universe. The only other person alive in that tier is Littlefinger. That's it.
Dany's squad is ridiculously fucking OP from every angle.