If this is a troll request, why hasn't it been nuked, and locked yet?
Reason: Circle size affects star rating, and max score. No point in even debating changing this.
And you can even change your object size already. Osu's scale is limited only to how large your screen is. Larger screen > larger hitobjects. If anyone is having a trouble with CS 5 notes being too small, then I question their ability to play that level of gameplay to begin with. (I play windowed on a 800x600 screen) and I have no problem hitting CS 5 notes. And there are a lot of people who have no problem with the current size and method of play and if there was a problem it would be handled in the modding process.
Final Note: If you are having problems, either use an easier mod and I'm not talking about easy mode. you're not going to have nearly as much trouble using the other simple modes, or just consider an easier level of play. osu! is designed to provide a map for every skill level, and currently there are plans for the imminent future to equalize even approval level maps, making then accesible for more players. The current imbalance in today's approval maps is the real issue here and that is something worth complaining about.
I pretty much covered every good reason that can said about this topic.
/thread