In Japan at least for now, that is. However, the system is approaching 2 years in North American and European markets and Sony could be gearing to do the same in those territories as well. I personally don't think the PlayStation 4 is slowing down outside of Japan, so it might not be the wisest decision for them...considering as a whole, Sony hasn't been able to turn a profit on their products...just by selling off buildings and divisions.
BUT! PlayStation is leading the charge and getting more systems into homes and getting more money generated from the software that goes with it...kinda crucial. So probably expect a NA and/or EU price drop announcement at this years PlayStation Experience event in December.