Clever, yes, I would say that Rock could play a little part as well. Of course, Hip-Hop plays the main role here, but I think it's okay that these other genres that are somehow a part of Hip-Hop can play a little role too.
To the question...I would make R&B/Soul as well, actually I am making it as well.
I respect you other's that are pure Hip-Hop, I used to be like that too when I was younger. I used to leave parties that didn't play Hip-Hop and couldn't stand any other genres! But then i got into producing and my whole world opened to other genres and today, R&B plays a big part as well, hell, I've even been messing with a little Trip-Hop, Lounge and 2Step. Then again, the difference might be that I see this as as business too, and the other Hip-Hop producers I know or are familiar with in Denmark make mostly R&B today (major label deals and radio singles and all), so I use them as a blueprint for where I'm going.