Limiting police power is a tough political goal. Right now police can literally shoot you dozens of times with their personal assault rifle that has "fuck you" engraved on it while you are lying on the ground with your hands on your head begging for your life, then get caught planting a gun on your body and face zero repercussions. And in discussions about this a huge number of people support the cops - "you never know, he could have been armed, we can't ever suggest a cop behaved badly because that would make other cops less willing to kill at a moment's notice" are real arguments people put forward. If you want to stop them from being able to pull people over for no reason so easily that sounds great but that is a HUGE undertaking.
1. I know enough to stop answering questions
2. I have a lawyer I can call and ask to get involved
Both 1 and 2 are, however, not choices for the vast majority of people.
Cameras in your vehicle and handing your attorney's business card with your driver's license are good deterrents that I highly recommend. Everyone has a plan until they get punched in the mouth.
They may even, as you say above, move to detain you and bring you in. Again, actually having a lawyer here is what's important, and again, usually not something most people can afford.