A Demo? I haven't seen many developers create a demo for a game in a long time. I'm not saying it doesn't happen. But it's not like how it was 10 years ago. I remember getting my monthly copy of PC Gamer that included a demo disk. This was of course before wide spread adoption of high speed (cable or better) internet and so a 100mb download took 5-10 hours via 56k dial up modem.
Although it depends on when they internally know when the game will release. Like they may be planning for Q2-Q3 at this point internally depending on current development cycle(s), so releasing a demo in the next few months would be "potentially" feasible if they can afford the man power. But I just don't see it happening.
Depends on how much work it is to truncate the Program just to include the SCW, if it is just 8 -16 Man hours it would be worth it, but if you need anything more then I agree that the effort would be better allocated to finishing the game itself.
Having said that I would still like to have a Demo, but can understand it if they don't produce one.