Also, this might be the biggest part for Momoa, since the rumored plan was to adapt ALL THE BOOKS, and Duncan Idaho is all six.
Maybe. Depending on their pacing though he might have a lot of downtime seeing as how he originally dies early ish in Dune, reappears and dies again in Children of Dune, then his later appearances are sporadic across 3500 years and could be done entirely via a montage before the final story leading up to the bridge and beyond.
That kind of long term casting lock can cause problems for actors at times which outweigh the potential benefits. Look at Kit Harrington when he was Jon Snow in GoT. He was contractually obliged to not cut his hair while the show was ongoing, although they did change his hairstyle slightly in the later seasons. It's a similar problem that resulted in the CGI-tache coverup in Justice League because Henry Cavill was still shooting Mission Impossible at the time.
Momoa isn't likely to change body wise as much as he has since his starts on Baywatch and [from a more geek/nerd PoV] Stargate: Atlantis as Ronon Dex but he's certainly changed his hair significantly at times seeing as how he was wearing a wig [of his own dreads] in the last season of SGA after cutting off his dreadlocks due to the weight they were putting on his head/neck: https://i.redd.it/tlxz7165lsp51.jpg
Maybe. Depending on their pacing though he might have a lot of downtime seeing as how he originally dies early ish in Dune, reappears and dies again in Children of Dune, then his later appearances are sporadic across 3500 years and could be done entirely via a montage before the final story leading up to the bridge and beyond.
That kind of long term casting lock can cause problems for actors at times which outweigh the potential benefits. Look at Kit Harrington when he was Jon Snow in GoT. He was contractually obliged to not cut his hair while the show was ongoing, although they did change his hairstyle slightly in the later seasons. It's a similar problem that resulted in the CGI-tache coverup in Justice League because Henry Cavill was still shooting Mission Impossible at the time.
Momoa isn't likely to change body wise as much as he has since his starts on Baywatch and [from a more geek/nerd PoV] Stargate: Atlantis as Ronon Dex but he's certainly changed his hair significantly at times seeing as how he was wearing a wig [of his own dreads] in the last season of SGA after cutting off his dreadlocks due to the weight they were putting on his head/neck: https://i.redd.it/tlxz7165lsp51.jpg