The Kingsguard (spoilers extended)

Episode 5 ends with 7 heros embarking on what seems to be a suicide mission. The trailer also suggests that they will encounter the night king himself. I can't see Jon escaping a second time and if Jon wont make it, none of the 7 probably will. All 7 will be turned.
This made me think pf the second most important seven member institution in Westeros - the kingsguard. Jon and co will probably take out a few white walkers, maybe all but the Night king. Then, who better to make your kingsguard than the furious 7 ?
Further Jon being revived once by ice and once by fire would bolster his Ice and fire protagonist credentials.