"Seems reasonable to expect that is the norm"
No, it is not. Any scientist will tell you that very little can be concluded from a sample size of one.
The only thing that we can reasonably deduce from studying our own solar system is that other stars may have planets, some of which may be gas giants.
The reason this study is interesting is the sheer number of stars we detect that do actually have planets. To think that a full third of a given sample have planets - and a disk that is facing us so we can detect them - is simply a staggering number.
In fact, it seems to me that, if 33% of star systems we can survey just happen to have planetary discs facing us, then a fair share of the others stars most probably have planetary discs as well, just not facing us.
If that is indeed the case, then we can venture that stars with planets is indeed the norm, which, all of a sudden, gives us a staggering number of planets to visit when we finally get our stuff together for intergalactic travel.
And that gives us every reason to get our species off this planet and into the stars, because once we do, near-infinite resources will become available.