I can see it being more of an issue than you might think. Just being in the Unimart at a bad time comes to mind, or just about anywhere else you might think of where you may have to deal with it. Even if you arent a cop, and as much as you dont want to get into it,or try to avoid it, you may just have to act.
This presumes that I'm gonna run toward the trouble. If I'm not going to actively insert myself into a potential shootout, and only in the most extreme of circumstances would I do so, then the likelihood of needing that practice is very slim. A better use of the time IMO is to run drills more likely to occure should a shootout happen.
That said good training is good for you even if it is taylored for an event that is most unlikely.