Excellent point about the taxis. Thought of suggesting you check the situation before leaving YOW for an excursion, but that might not work either.
I had my taxi driver monitor the situation to decide best pick up time. No problems so he picked me up normal. Half way to airport he learned the protesters had started a problem. I got quite a scolding from the check in agent, I was late and the last, and she tagged my bag as “Late Arrival”. Good thing I had Global Entry.