x86 came out 1978,
21 years after, x64 came out 1999
we are three years overdue for a shift, and I don’t mean to arm. Is there just no point to it? 128 bit computing is a thing and has been in the talks since 1976 according to Wikipedia. Why hasn’t it been widely adopted by now?
Let me put it this way: computing is evolving in a way where SMALLER registers are actually more important for new types of algorithmical necessities. AI/ML is a great example - you have to program in specialty frameworks such as CUDA or Tensorflow which want to have registers as small as 8bit so that things are done faster, in the GPU or in L1/2 cache. The hardware of GPUs for instance is made with 8 and 16b logical processing units in mind.
Larger registers only really help a portion of computing, while you can emulate the odd large register you may need without affecting performance THAT much with a combination of smaller registers.