Statistically, I wouldn't be too concerned about flying on a Boeing Max-8 even if it does turn out to be an issue, as your odds are still probably better than crossing the street, or driving anywhere.

However, I would be very concerned if you have upcoming flights booked on airlines which operate these aircraft, as it seems quite likely that more civil aviation authorities will ground them, unless it becomes apparent quickly that the issue is not related to the Lion Air systems issues. Perhaps not in the USA because it's Boeing, but pretty well everywhere else.