A quality decline in NnP had something to do with budget, and we all know that they nearly went bankrupt. Pessimistic assumption is alright, but I think people should at least wait and see for their next title first. If they release another title, that is. And if it turns out to be shitty as well, then they can say, "Minori, the next Softhouse-Seal!!"
There are a few things that should be taken into consideration, but well, the simplest chain of thought for people would be "NnP is almost like a nukige and it sells really well. Therefore, every new VN from Minori will be a nukige-like." So