With will and determination. You operate under the assumption that nothing is going to change, and maybe that is true to the casual observer. Maybe GSB doesn't do much besides pass out huge sums of money to student groups, and barring any major paradigm shifts, they aren't likely to exclude anything you are involved with. Maybe they can argue until they are blue in the face about hats and tuition increases. It is entirely possible that they can promise to argue against tuition increases all they want and that promise will remain an empty one because the Board of Regents is going to do whatever they want to do in spite of our objections.
Student government CAN be powerful if the right people are elected to office.
If the right activist is sitting in the president's seat, they can speak on our behalf. They can organize student opinion and take it to the Regents and demand to be heard. Maybe right now it doesn't work that way, but it could. Power isn't just handed out. You don't just take what you are given and leave it at that.