The whole point of disruptive innovation is to build something which most customers do not want, with the bet that due to technology/market trends, market demand will grow exponentially in the future. Unlike the above, this is a real dilemma because if you're an established successful company, it's hard to justify pouring energy and resources into something for which the demand doesn't exist. If you're building something to meet a market demand that already exists, that's not disruptive innovation, that's just innovation, period. It's something people have been doing for millennia, and there's no dilemma here.
Sorry for sounding like an angry old man. It just annoys me when I see specific terms with specific meanings get bastardized into meaningless buzz words.