With the new rule about emergency QBs, I would actually expect both Sudfeld and Martinez to last at least until Hooker is healthy enough that he could take snaps in case of emergency. If they start Hooker on the NFI list (which only makes sense), then he can’t play for the first eight weeks.
QB Active: Goff, Bridgewater
QB Emergency (dresses but not active unless QB1 and QB2 are injured or ejected): Sudfeld
QB Practice Squad: Martinez
NFI: Hooker
After eight weeks, if you feel more comfortable with Hooker than Sudfeld, you could release Sudfeld and activate Hooker. After the eight weeks you could also choose to start having Hooker practice, though if he’s not activated within three weeks of starting to practice he is ineligible to play for the rest of the season. I think I would just as soon let Hooker just soak it all in from the sideline for a full year though. Let him practice at some point if you’re 100% comfortable with Sudfeld as QB3.