That would go hand and hand with viewers hearing about the wall for 6 seasons and then having it shredded in less than a minute from some ice breathing snow melting dragon. Winter is coming! Then Snow/Arya/Jamie go rogue and land a killing blow on bad boss and all the bad guys die. Sounds like a bad ending.
Have Dany burn down all the rubbish with her dragons, let them swing a few swords against night king, then have cersei and company flip the script and attack the northerners and make it an absolute blood bath. The only thing that remains is Tyrion, a room full of hookers, and of course Briene and the Hound. They shall restart civilization with lots of amazing amazon style sex.