Hmm. A thought WRT Ada:
The development of Ada Compilers ended up being badly timed, with the compilers showing up at about the same time as personal computers. But Ada was a BIG language, with big compilers, big runtime environments, and big resource requirements. You couldn't run an Ada compiler on your floppy-base PC, and if you could somehow cross-compile your application on the $$mainframe$$, it wouldn't run very well on the 640k PC, either.
Smaller, simpler languages (BASIC, Forth, C, Pascal) won the day, as well as the hearts and souls of a generation or two of programmers.
A decade or two later, Moore's law had had its way with PCs, and Big Compilers and RTEs were no longer considered much of a problem. Big Languages (C++, Jave, Python) have re-surfaced with a vengeance, and no one thinks twice about throwing (former) super-computer class processing at compilation, even for "small" final environments. (C++ for $1 8kB microcontrollers, MicroPython for somewhat bigger $5 chips.)
If Ada had come along later - say at the same time as Java, it might have been more accepted.
If it had been a few years earlier, it might have picked up more popularity prior to the PC revolution, and done better (vendors wrote Fortran for PCs...)