Game of Thrones is not without shocking scenes, and that's what makes the show so interesting; whether it be Theon Greyjoy getting castrated or Jamie Lannister losing his hand. With the final season in the works, a theory is coming out that Tyrion Lannister—arguably everyone's favorite character—is going to somehow lose his tongue.
Youtuber Alt Shift X theorizes:
The gist of it is, since is, every significant character has somehow had their supposed "weapon" taken away from them. Jaime loses the hand that made him a master swordsman, and Cersei was stripped of her beauty when she was forced to do the walk of shame. With Tyrion's only asset being his mind and his sharp tongue, it would certainly be a huge shocker if he was suddenly left unable to speak.
There's also the fact that Tyrion has been threatened several times by numerous characters that he would have his tongue cut off.
With the fact that Tyrion is already miserable as he is being a dwarf, I think it would be overkill to have him lose the only thing that made him interesting. I think the series was already merciful enough to let him keep his nose after the Battle of Blackwater, but then again, I just think it would be too much of a hassle to CGI out Tyrion's nose in every scene.
Just looking at season 7 though, a lot of criticism is going toward the fact that the show has somehow coated all the main characters in "plot armor," ensuring their safety no matter the odds; a shame since Game of Thrones' main hook was that no character was safe.
So will Tyrion lose his tongue? I don't think it's likely, but since it is the show's last season, it would definitely be a shocker to a lot of audience members.
Game of Thrones 8 is expected to air sometime in 2019.