Couple questions about rooting

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http://androidforums.com – This is my first time posting here so hello all. I'm running 5.9.902 on my phone and I am considering rooting my phone, but I have a few questions since im new to this. Is there a way to unroot the phone after rooting if needed? What happens if an update from verizon pops up? How would that hurt a rooted phone? Can I avoid updating somehow? I really don't care about these custom roms because the only things I want are wifi tether and ps3 controller, but are custom roms really needed? Can Verizon really track you using wifi tether? Has anyone been busted? If someone could shed (General)