ASM is still used in some areas, such as:

1. function trampolines, such as in libraries like ATL (Microsoft's COM template library);

2. hand-optimized encoders/decoders for things like ffmpeg;

3. niche applications such as Ben Eater's 6502 breadboard computer (using a modified WozMon and Microsoft BASIC);

4. reading ASM output from C/C++ code in things like the GodBolt site for performance comparisons/analysis;

5. reverse engineering old DOS games;

6. people working on things like compilers (generating optimized assembly), JIT engines, or other code generation -- though this will typically be machine code, possibly with assembly instruction comments;

and other performance critical places where assembly can speed up that part of the code.

Absolutely, by 1% of developers. So analogy would be that those 1% would understand the code fully in the coming years.