I think it's great that PDS is making a space game, for a bunch of reasons:
- As others have mentioned, this is a game they say they've wanted to make for a long time. This is a good thing - a motivated team working on a dream project is good

.
- A space game unfetters the design reigns a bit which allows them to try things they may not be able to try in a historical game, but will help them learn new ways of developing GSG gameplay mechanics that could benefit the historical games (for example, we're seeing pop-style gameplay cropping up outside Vicky for the first time, but also in a different and evolved way).
- It's still strategy - I wouldn't say it's going away from their core gameplay at all (anything but), it's just the setting that's mixing it up.
- It's good to try the occasional new thing to stay fresh and get new ideas (for this reason, I think Runemaster was a good thing, even if it never comes back and doesn't get launched - as a studio, they'll still have deepened their understanding of development, and Podcat has said Runemaster helped the Clausewitz engine develop further as well).
- Imagine if PDS had never tried anything new - we'd never have had Vicky with factories and pops, or HoI (HoI in is a bit different from the 'empire building' nature of CK/EU/Vicky).
Nothing wrong with having your personal preferences, of course, but we should also respect those of PDS (for example, I was also hoping Stellaris was a historical game, although the more I hear about it, the happier I am that it isn't

).
No I don't demand anything but I am talking about pure business sense, if core of my business is making grand strategy history games and I don't issue a single game of that type in 3-4 yrs, then I think my business strategy need to be readjusted.
It's like if all of sudden Toyota decides to make airplanes instead of cars in the next 3-4 yrs.
PDS is still making its core historical GSGs though. EU4 came out in 2013, and HoI4 was originally expected to launch this year (they just got a bit too ambitious with it and it took a bit longer, which shows a commitement to historical games, rather than the opposite). Next year, when Stellaris launches (assuming no delays), they'll also launch HoI4.
I'd also bet good money that at least one of their other two products that's coming along is a historical GSG.