Much as we're rooting for these two kids to make it work, it seems like a long shot that they'll both make it out of the imminent Battle of Winterfell alive. No main character on Game of Thrones has uttered the phrase "Valar Morghulis" more frequently than Arya Stark, and her preapocalypse tryst with Gendry doesn't bode well for either of their longevity. However, while at least half of this couple is likely doomed, we're not entirely sure which half it is.
Arya still has a lot of unfinished business in Westeros: not only are there still a few big names left on her list, but she's finally reunited with her family and made peace with Sansa, so it would be a shame to lose her now . . . although that sort of sentimentality has never seemed to matter much to this show before.
On the other hand, Gendry is the last living Baratheon, and unless Arya became pregnant during their one time together (which seems unlikely, since one assumes that a girl would've been careful), losing him now would mean that House Baratheon is gone for good. Several of the Great Houses have already been wiped out — RIP House Tyrell and House Martell — but we suspect the show has a reason for keeping a Baratheon around for this long.
One of these two is almost certainly on the chopping block, but the other one is most likely safe. If we had to place a bet, we think the odds may favour Arya ever so slightly, but really, this one could go either way.