I agree with the sentiment of the latter part of what @Renagede77 said. A certain “charm” is lost with the realism, however, I do prefer the new style and after going back and playing the 1 and 2, found myself noticing its faults more and more. I think ideally there would be a slight pull back in the realism to regain the “toony” charm that was originally had while keeping the honestly breathtaking new style largely intact. No doubt, finding that balance would be difficult and would leave some people still discontent, but it seems to me to be the best option.
Final note, @felix.meme made a great suggestion in remaking the previous games. I personally really like that idea, but completely understand why y'all wouldn't go in this direction.
Either way, I have complete faith in the team you've formed to make the choice for OPT, and it's community! Keep up the good work, we all believe in you!