Making it a movie would ruin it. Unless it was more of a “Literary” film like 2001 and even then a fancy director would have to stray from the original to make it work visually and add conflict. Just read it. I believe in Rama’s premise. Aliens just wouldn’t be interested in us in the same way we’re not interested in local squirrel population. Rama answers the “great filter” question. Where is all the intelligent life going in universe? Right under our noses doing its thing while we do ours. Maybe on our AI will be interesting to aliens.