Yeah, we might not get a version 7 in a long time (or at least until the makers find some time away from Norn Saber). I believe they'll still make an effort make make new versions though because there are still many wlo fans and not updating would simply mess up the whole game and thus some people who but points may lose interest and they would get less income.
http://wlodb.com/topics/5749 (Birthday Calendar: please click and see)