These 4GL database/programming products seemed poised to succeed in the web era. Think of building small or medium web sites with database and programming language all-in-one. Instead of succeeding, these 4GL products disappeared. I wonder why they failed to adapt to the web era - they seemed ideal for providing web-based database solutions.
Those 4GL database tools made accessing data far more easily and seamlessly than the solutions today. Also, I suspect there was some snobbishness amongst programmers who didn't view these products as 'real' programming languages.
Today, we have clumsy, glued-together solutions for web development with databases. Don't believe me? See this recent discussion on SQLite on HN [1]. I sense that lots of posters and readers in that thread are looking for a concurrent database that is simple and easy-to-deploy and turn to SQLite even when it is not designed for concurrency.
[1] Have you used SQLite as a primary database? https://news.ycombinator.com/item?id=31152490)