99,9% of code written will not be specific to ARM, nor will it be CUDA code.
Most programmers will still be busy assembling software from prefabricated low-level parts (which may have ARM optimizations or run on CUDA). If (for example) you use Tensorflow, you will not need to deal with CUDA, even though Tensorflow runs on top of it.
GPU programming is not for the faint of heart, debugging is much more tedious and you need to "think" parallel. You can't be a clown programming GPUs like you can with Javascript. There aren't a lot of jobs to go around either, even though they may be well-paid.
Most programmers will still be busy assembling software from prefabricated low-level parts (which may have ARM optimizations or run on CUDA). If (for example) you use Tensorflow, you will not need to deal with CUDA, even though Tensorflow runs on top of it.
GPU programming is not for the faint of heart, debugging is much more tedious and you need to "think" parallel. You can't be a clown programming GPUs like you can with Javascript. There aren't a lot of jobs to go around either, even though they may be well-paid.