As long as there are relational databases out there, there will be SQL and the prime reason is the fact it is based in something called relational algebra, which deals with relationships and operators in a formal (mathematical) way. The author mentions the fact that systems generate SQL anyway, but we have to keep in mind that there are different type of languages, while systems very well manage DDL, when it comes to DML, they have their limitations. When people have access to those systems, they may use them to generate version 0 of the program, but it require many iterations before they perform properly.