While SQL has a large class of uses, and also a smaller class of problems for which better solutions exist (CAP constraints, time series and other massive self-

While SQL has a large class of uses, and also a smaller class of problems for which better solutions exist (CAP constraints, time series and other massive self-join apps, session storage ...) the reason we're going to use SQL in another 40 years still is that there's no cross-vendor standardization effort going on anymore (NoSQL vendors don't seem to find it necessary to drive sales and market growth, and customers don't demand it either).