Nope never considered quitting from a crash.
I know some of us, including myself already have lasting injuries but I don't regret any one of them and I'm willing to feel it again to keep riding. I guess it's just an individual thing though, personally I'd rather be out there doing it and taking chances than live a life of what ifs. I don't have a family/kids to support, and I can understand how that could change a persons mindset on things. Every time I've had a really bad slam with injuries the first thing on my mind and the first thing I want to do is get back out there and do it right the next time but there's nothing wrong with another person having second thoughts. To each their own.