Designer are learning more and more about the PS3's Hardware everyday and how to use it efficiently. I think we will start seeing more game now that don't require a install to play. Also to answer your main question the size of installs never scares me nor my PS3 away from a game because I have a 250gb HDD.
*Al Bundy's My Hero*
*Al Bundy For President*
Waiting On GT7!!!
PSN ID: Acidfacekiller