There's too much diversity in the style right now to make this call. Let is develop for a year or two more and come back to the issue. There are still brewers using sinamar or only dehusked carafa to make their IPAs black, and others are using chocolate and black malts so you're getting completely different flavors.
If the chocolate and black malt versions end up predominating, then they really will be pretty much hoppy porters. If brewers stick to really wanting just color and as little dark malt flavor as possible, I think it will remain a unique novelty.
Cross Dressing Amateurs is a good one though.