“While there is halachic support for meat meals on Yom Tov, there are also great rabbis who have advocated becoming vegetarians, including Chaim Zundel Maccoby, the Kamenitzer Maggid; Rabbi David Cohen “The Nazir”, his son Rabbi Shear Yashuv Cohen, his son in law Rabbi Shlomo Goren; and current UK Chief Rabbi Jonathan Sacks, all themselves vegetarians. Rav Kook “
I would really love to know how all these vegetarians will eat the Korban Pesach when we have the Beis Hamidash again.