Actually I agree with Trixster. Using your imagination and dreaming up new ideas to try is where the best cutting edge original shit comes from.
I had the same idea and curiousity in my head about Rockstar possibly pulling a huge suprise on us and releasing SF and LV as add ons to GTA 5 a few months ago...
and since I have an IQ of 142 and own 3 businesses... I am far from stupid.
So I dont think Knights idea is stupid at all. Its a cool idea.
So YES I would buy all 3 games if they were released on seperate discs.