It's really hard to tell what could happen from now on. In fact GoT's known for being very unpredictable. That said, theories will still arise.
I myself would love to think that the Lannisters will get nowhere. It's been a terrible reign. Also you the Starks will start bumping into each other as we saw Sansa and Jon last episode. Daenerys is coming very strong but maybe not as strong as we think.
Maybe Westeros will take over the Lannisters but will still need Daenerys crystals? Too early to tell...