Well yes, because I argued that it was irrelevant to the original question: can SQL be improved?
Additionally I actually did address the question of SQL’s stability, at least partially: it’s not SQL thats so stable, but the relational model. SQL just happened to be IBM’s, and IBM was highly successful pushing its DB around, and Oracle (kind-of) cloned it to push their DB around with less contention, and so it went on. But its the RDBMS engine that primarily pushes a DB’s value; The SQL language is a ride-along.
And once more to be clear: its longevity is not a result of SQL’s quality, but the quality of the relational model. Thus its popularity, and stability (its also not that stable, in that its heavily extended by everyone in arbitrary fashion), is irrelevant to the original question.
>SQL is not that popular, as the NOSQL movement
If people are trying to make use of NoSQL because they want to avoid the SQL language (not the relational model), they’ve made a grave mistake in understanding their technologies; I don’t think such a naive opinion should be considered relevant to the equation.
If they’ve chosen NoSQL to avoid the relational model, then their choice says nothing about the SQL language.