The live action will fix a problem that has plagued the manga and anime, slow pacing.
No way to drag the entire story in 9 seasons years, 90 episodes
This is definitely true. You can't do things slowly in live action like in manga or anime. Also they have the issue already mentioned once with the aging of characters.
And I believe if they are doing well with the live action and have a good response, I beliebe they will continue working on it without many breaks.
There are a lot of arcs to cover but I think if they can put East Blue into one season, then maybe they will be able to do the arcs in seasons as followed:
1. East Blue Saga
2. Alabasta Saga + Skypeia Saga (Whiskey Peak, Little Garden, Drum, Alabasta, Jaya and Skypeia)
3. Enies Lobby Saga (Davy Backfight, Water Seven, Enies Lobby, Post Enies Lobby)
4. Thriller Bark and Sabaody Archipelago (depending on length maybe even Amazon Lily but I tell you, the disappearance of whole SH crew would be a great cliffhanger!)
5. Summit War Saga (Amazon Lily, Impel Down, Marineford, Post-Marineford)
6. Reunion Saga (Sabaody, Fishman Island)
7. Dressrosa Saga (Punk Hazard, Dressrosa, maybe even Zou as Sanji Cliffhanger?)
8. Yonko Territory Saga (WCI and Wano)
If the series will ever run that long. Maybe they'll have different season lengths but cliffhangers and arc ends are enough to use