By the time she'd be a valuable asset, we'll probably be near the end. If there's a world war with Imu and them then I can see her being an ally, like part of the Grand Fleet or something like that.
However, I still don't see her being on the crew itself so near the end. Wouldn't you want to see Tama be in 200+ chapters instead of just 100? The later they get introduced, the less amount of pages they'll be in.
That's something to think about.