re: Is there any chance we get a satisfying ending to GoT?

I've read so much on GoT and watched enough youtube videos to be unclear where my theories begin and other more learned maester's end, but this is what I think today:

1) Eons ago as the WW and First Men/Andals/Children of Forest battled it out, the latter figured out the WW and wights could be defeated with Dragons and Dragonglass and they began slaughtering the WW.

2) The WW retreat north and build the wall to keep the men out and end the slaughter. The have spent last few millennia riding it out with occasional raid south ("winter").

3) The time has come when men have forgotten or disbelieve in them. They ride south, dissolve the wall, and begin wreaking havoc.

4)???

5) Profit.