Development would have to reach the realm of what I call is technical tedium and go through massive amount of micro technical details that it becomes an infeasible development cycle that would feel like constant crunch to reach modern technical standards for 60+ hour game.
I feel making a AAA mainstream JRPG is simply the largest undertaking in gaming industry. pre-production, create hundreds of art assets, and story-boarding a 60 hour story would be hell. Getting animators, writers to do tens of thousands of lines and top notch voicing acting for multiple languages would be hell. Hours of motion capturing actors would be hell. Then, you got bring in a fukking orchestra to do enough music for 80 hour game and lets not even get into sound engineering. Getting high visual fidelity that comes with JRPG would be a nightmare( Like FF7R doesn't have bad texture, but texture streaming is hella limited on ps4. So, shyt looks blurry and FF7 remake gets too much hatefor n it. When it drops on PC in a year and it still looks awful. I'd agree.) Then, you still got to make or buy a fukking game engine.
That's like 1 1/2 year of work alone.