Halachic Revolutions - Significance?

 The recent Angels's Boycott brought up an important issue - What is the true authority behind halacha - gedolim or widespread acceptance?

There have been a many of revolutions or attempted revolutions this is only a partial list

The question is Once the revised halacha is accepted is the original mesora no longer valid?

Acceptance of Talmud Bavli

Kiddushei Katana

Mishna Torah

Shulchan Aruch

Chassidus

Kitniyos

Girl's formal Torah education

Doublimg measures

Sheitel for hair cover

Mishna Berura as final halacha

Daas Torah as final arbiter of everything

Rav Moshe as the Posek Hador

Loshan Hara as halacha rather than ethical behaviour

Modesty by Rabbi Falk

Glatt kosher

Yoshan

Chalav Yisroel

Shemitta

Kabbalah/Zohar

Techeles

Shatnes

All bugs are treif

Science vs Chazal

Chalitz required

Conversion reqires full acceptance of mitzvos

Tefillin need to be hand made

Kollel

Troppper's attempt to convert intermarried spouse

Kiddushei Taus instead of Get

Reporting Sexual abuse to police