The Amount Of Seasons
Based on everything that has been set up there is no possible way for them to end the story in a non rushed way in 2 more seasons.
The showrunners were asked recently if they knew the amount of seasons the show was gonna be and they didn't give an answer. I feel like at the very least they would have said they are planning on doing 5 seasons if they were.
There is nothing wrong with a show being more than 5 or 7 seasons. It depends on the story that is being told. For example Game of Thrones could have lasted 12-13 seasons because that's how much story there was.
It all depends on the story. Just because it made sense for one show to end in 5 or 6 seasons that doesn't mean it makes sense for another show to end in that amount of seasons.
I already know some people want the show to end soon so they can get all the answers but to those who are enjoying the ride and don't mind waiting for answers, I am telling you with everything that has been set up it is not possible for them to wrap up the story in a satisfying non rushed way in 2 more seasons.