Disclaimer – I have no association with GOT/ HBO therefore no insider knowledge. This is simply a 8 years Game Of Thrones thank you for memories shirt for who a big fan. And after analysing all 7 series of GOT & just my take on the information we as fans have received throughout the show. And a little help from the many GOT fans brilliantly presented Jon /Dany & Gendry family trees that have been posted online.
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The end result of the mission could go one of two ways a sad ending where the ultimate sacrifice is made. Where Gendry & Viserion die along with all of the Night Kings army. The ultimate sacrifice for the greater good, or my preferred option of a happy ending only available due to the Targaryen blood in Gendry. The bond between Targaryens and Dragons. Allowing Gendry to either be able to control the dragon and ride him to the location of the bag. With the things needed for the reversal. (& Jon if he were to go with Gendry on the mission) and then Gendry using the information. And instructions from Sam is able to reverse himself & Viserion back to their original form. If he took enough of the reversal tool on his being. When approaching the Night King he could do it straight away.
Then with the Night King & walkers all dead the show could end in one of 2 ways. With Gendry dying as he kills the Night King & the undead army. Then the scene cutting to Dragonstone & Kings Landing where we see the snow start to melt proving the Night King is dead.
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Or Happy option, where the back to human Gendry either alone or with Jon depending on which concept is preferred. Besides, can ride the back to life Viserion to Dragon Stone where Dany & the gang eg Jorah, Davos, Tyrion, Varys etc are waiting. For those who crazy abou movie, this 8 years Game Of Thrones thank you for memories shirt for you. As a results, Dany is reunited with her dragon and the scene could cut to the snow. Melting in Kings Landing & everywhere else. For that matter again proving the Night King is dead and the war is over.