I think AI will definitely help to get new compilers going. Maybe not the full product, yet. But it helps a lot to create all the working parts you need to get going. Taking lengthy specs and translating them into code is something AI does quite well - I asked it to give me a disassembler - and it did well. So, if you want to make a new compiler, you now don't have to read all the specs and details beforehand. Just let the AI mess with e.g. PE-Headers and only take care later if something in that area doesn't work.