I wouldn't buy it:
1. no reason to believe TW can make a good sci-fi game (they never did)
2. I am not that crazy about sci-fi to buy every sci-fi game, just the "must-play" ones
Same reasons are why I think they shouldn't do it and it will likely flop:
1. they will most likely not be good enough in that space due to inexperience, engine immaturity and crazy competition (no man's sky, starfield, star citizen etc)
2. their current audience is in the medieval genre and they might not be buying the sci-fi stuff
M&B got its success because it's an A-tier medieval game. Hope we see a good expansion soon.
TLDR: TW are good at medieval stuff, not sci-fi, also sci-fi has a higher bar (even Starfield flopped)