I agree, I would plug it as well and ride it for the remainder of the trip if I'm away from home. But I would in all likeliness eventually replace a tire at home.It doesn't look that close to the sidewall to me either. I'd plug it and give it a try.
If it was further away from the edge, not a problem. I have ridden tires with plugs in them for thousands of miles, but not that comfortable that close to the edge. That is the most flexing part of the tire, especially while cornering.