As to if musicianship is dying, I'd say absolutely not! Just watch all the child prodigies coming up. There's plenty of kids out there playing jazz, classical and other "traditional " forms at extremely high levels.

I remember being interested in jazz at a young age, and it was a major chore to find the classic albums that my teacher would recommend to listen too. Now you can listen to any Charlie Parker song instantly, find transcriptions for free, as well as tutorials. If there are no jazz teachers in your area you can easily study with the worlds best teachers via Zoom or whatever. The information is ready available and apparently not all kids are addicted to video games. Some are becoming great players, but I do wonder if they will have an audience that appreciates their talents once that aren't cute kids anymore?