My concern is that in the end all of this won't even be Namor and we are all losing our heads for nothing, imagine if Marvel MCU ends up saying that Atlantis is El Dorado, which a totally and different thing from Atlantis, yet they just slap the name Atlantis on there?
I have no doubt that if the MCU does bring in Namor and changes up Atlantis, then the same will follow in the comics. Marvel's already been doing this for years anyways, remember the terrible Magneto-Maximoff retcon? All I want is for Namor and Atlantis to finally be expanded on in the comics and have some good attention with creators but not at the expense of exploiting another culture's heritage/stories and just saying "yeah this is Atlantis now".
I personally worry about T'Challa's death explained and hope they don't make Namor the reason T'Challa is dead. I hate the whole Atlantis/Wakanda war because it makes no sense, but I'm hoping the director realizes this and we just have a Kiber Island incident plot or something.
Defenders (1972) #84
edit: However I am excited for Tenoch and really want to give this movie a fair chance and enjoy it.