We are also very disappointed, Passaia was our family drink on special occasions and was much appreciated and loved by everyone. We will miss it enormously. I hope you will reverse your decision. Please don't take it out of the range!
From my point of view, no great loss, drank a lot in my childhood, but hardly bought any more in recent years, have found better alternatives and will probably not be the only one, tradition or not, apparently the sales of Passaia were no longer satisfactory for Migros.