Depends on how many people decide to defy them. If it's just a couple of hundred, I'm sure they can handle it. Remember, not everyone will care enough to protest. Some will think it's bad, but not worth going to jail over, or losing their shot at becoming the best in their chosen field. Others may even agree with the Russian government's position. And some may believe that the Olympics shouldn't be used to espouse any political/religious belief, even if they agree with it.
You can't always count on people to agree on what the right thing is, let alone to do it.