Two of you main characters and the ship, you won't be able to do anything overly dramatic with. The show will end up like the TOS novels and comics, where all the toys have to be returned to the box the way they were found.
You say that like its a bad thing, its a relief after the long habit of killing off characters carelessly that has become over used in TV within the last decade or so.
There are so many sorts of stories they can tell without killing and maiming those 3 characters. Plus there is likely to be more major crew added to the show like new Bridge officers. They won't just have a bridge crew of 3.
Personally I'm hoping they go for more traditional episodic weekly adventures, the rest of the shows appear to be Arc heavy so it'd be nice to have one of the series be more traditional explore and move on for most of the episodes.