>>723112580 (OP)
because neither a controller nor a keyboard really allows for the sort of flexibility of motion you'd need to make an open world game without magic feel worth buying from a combat perspective.
Story wise is iffy but seeing as it's GoT they are going to have to be rated A(18+) which not Triple A company will go for. Also you'd probably want Elder Scrolls tier modding capabilities so you can set it whenever.
That said I would absolutely play Stark and take over the North and build tall once i had everything, fuck the south.