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