I am a little worried though, there is a rumor going around FB that someone from the crew of H50 mentioned that if the show is renewed, both Scott and Grace are trying to find ways to change their contracts

Well where smoke is there is fire, and TBH I was expecting this for a while now both live out side Hawaii and now Grace having a baby which she will raise in Canada I may assume and Scott not really liking to live in Hawaii most of the year I can see they want to change it the question is will they want to leave the show or working less on H5O both has a 7 year contact......If they both leave it will be the end of the show IMO

Well, I don't really know how real that rumor is.... But I agree, when people start talking like that, something has been said somewhere.
I'm pretty certain that Scott and Alex are the only ones with 7 years contract, and Grace and DDK with 5 years.
But I don't think they're that worried about job ATM... I mean, Grace is probably wanting to focus more on the family, and she has never stayed without a job, even working in two shows at the same time more than once (Edgemont and Battlestar (for 2 years in both at the same time), than 2 years before BSG ended she was also a regular in The Cleanier; and then on the last season of The Cleaner she got a gig in The Border until she left to join H50)
As for Scott I have a feeling he wants to dedicate himself to writing and plays.... I think he's thinking big into changing from actor to producer/writer or something like that

Being a mom I know what Grace feels leaving your baby for a week is terrible so I understand if she wants some changes a new job don't solve her problems bc most shows are shoot in LA or it has to be she wants to quit fulltime for a while. For Scott I think your right but to produce or write new things he needs a paying job he can't live from the air alone. Both knew what they were doing when they sign their contract If Peter is willing to help them I think they will stay but we the fans will see less of them