I don't think it's wise to base Christian beliefs on Jewish tradition...
And yet our Lord was Jewish and observed every bit of their faith with them. Was He wasting His time? The command to celebrate Passover forever was one given from God to Israel. There is no forever if it stops. Jesus didn't come to change one bit of God's Law, He came to fulfill it.
You are throwing the baby out with the bathwater. The law which ended was the chastisement of Deuteronomy ("The Second Law"). This was the Law of Moses. It was given through a man for the reproof of a hard-hearted Israel. Christ fulfilled that law for man so we are no longer subject to its harsh strictures.
God's Law is forever. It has not changed. We still have the Ten Commandments... we just understand them better. What did Christ tell us? There are Two Commandments. We are to love God and love our neighbor. If you read the Ten Commandments, you will read the same things. Numbers mean things in Judaism. Three is a number for God (they didn't understand it was because He was a triune God) and seven is the number signifying covenant. In the Ten Commandments, we find that the first three are about our relationship with God and the other seven about our relationships with each other. Jesus's two commandments are the fulfillment of God's Law... He told us why we shall and shalt not... we shall and shalt not out of love for God and neighbor.