As someone who went NC with her parents in the 1980s & never went back on it, I agree with some of the posters above: NC is easier than LC, you can only do it when you're ready, you can leave them to others in the family (with a wry smile if they always prioritised those people above you) & writing down now your reasons for wanting to go NC is valuable because the longer you're away from them & in the normal world, the more you forget what they're like because you get used to the normality & start to assume that everyone must be like this.
For me, NC was absolutely worth it, though still painful as it means accepting that you'll never have a happy FOO (family of origin) & will never have supportive parents who are there for you & your own family - but you already don't have supportive parents & nothing will change that. You may feel that you're going against all the societal rules, or your own personal morality, in cutting off your parents, but your parents haven't been playing the game fairly & have no intention of changing now.
Here are some of the unpleasant things that can happen, but I would say don't let them put you off making the decision YOU want to make & feel most comfortable with:
It may be that you feel guilty at first, & you may get 'flying monkeys' who will try to make you feel bad & emotionally blackmail you into seeing your parents again, taking responsibility for them, etc. Stand firm against the FMs. They don't care about your interests in this matter, because they're either representing your parents' interests or their own: sometimes people try to get the escapee back into her old place in the family because without her there, someone else is selected as a target or as the person who will take on the problem of the parents. That's somebody else's problem now. Just tell them you don't want to discuss it.
You may find that if you go NC with one part of the family, another person or group will side with them against you. You can end up losing more people than you originally thought you would - even people you assumed would see the truth/support you. OTOH, some people may surprise you in a nice way, with unexpected support or confirmation of your experiences.
The people you've gone NC with may run a 'smear campaign' against you, by spreading untruths about you. In my case, my parents did it to justify themselves by rewriting history to make me out to be the bad guy in scenarios in which THEY were the bad guys. They needed an answer to the question, "So why isn't Android seeing you any more?" & they couldn't tell the truth. One relative told me years later, & said, "I knew there had to be more to it than that."
Going NC changes things completely, for the better in my case. I've never regretted doing it. I regret the NEED to do it, but I had no choice. I wish things had been different, I tried to make things different, I hoped that things could be different - & then I accepted that things were as they were & would never change, so I removed myself from the situation.
Good luck with whatever you decide to do.