good evening world i have an amazing idea how would you like this game if it was in 3D maybe we should talk to the developer to see what he might be up to
It would:
1. Take unreasonably long time. You might as well just create a new game.
2. Most likely look bad, 3d often fails in hands of a novice dev.
3. Make it for a different kind of people. Fans of 2d here are not the same as fans of 3d, even if done well. So it would mean abandoning already existing fans for something else.
4. Remaking this same game in 3d would also mean no new content for year(s), because you'll just recreate what was there already. If you don't - you're creating a new game.
5. Make system requirements much, much higher than RPGM. It'll most likely not run smoothly for many people.
So yeah. But i suppose insane devs do exist, such as "Sex and fantasy - Village of centaurs" dev that seemed to decided to make it 3d after all, it's not impossible.