You really do not know when a volcano will erupt, or how long it will blow. We were stuck in Zurich for the last round, and it was very unsettling. Folks are traveling as if everything is over, but some travelers are still stuck — in Hong Kong, in Borneo, in India, I was reading.
I would be in Europe if I had had tickets this month, too; but I would have made contingency plans to stay there for months if necessary.
We were in Germany, and as you say, it was very unsettling. We were fortunate that flights had resumed when we were due to come home, but we weren’t reassured until we had our boarding passes in our hot little hands.