Unless the guy is independently wealthy, or was overinsured, you probably won't get much out of him. If your lawyer is really good, and you can prove some extenuating circumstances, such as some bar was willfully negligent by serving him excess alcohol after he was obviously inebriated, then you might be able to go after the business, which should have much higher liability insurance. Or if he was out at a business meeting, throwing back a few with some clients. It is a long shot, but it is much more profitable to go after a company with multimillion dollar insurance coverage, than a drunk insured to 100K.

Something like 98% of all cases end up settling for the insurance without going to court. It is just too costly, even for insurance companies, to go to court very often.