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To be fair, the interviewer used the provocative word "obsolete" when he asked the question. Dr. Stroustrup answered it honestly and use the words "merged" and "more compatible" and said there is no technical reason for the few existing differences today.

He also pointed out that he worked closely with the late dmr (office was just three doors down the hall) and still has strong ties to other famous and well-known C gurus (dinner with Brian Kernighan) and that C and C++ coexisted w/o issue in their world.

His final point was the best though... he pointed out how programmers argue and fight about which is better, not the designers and researchers themselves.

Edit: Also, the new C11 standard brings C closer to being a complete subset of C++ and subsequent standards will continue doing this until they are merged, but this won't make C obsolete.