I think it would have been better had the Protestants changed to the Catholic Mass, since the latter is an older, deeper, and more authentic way to reach God the God Within. The general problem, however, is the fading interest in Christianity in the world, which Vatican II was essentially trying to deal with by moving toward connection between all Christians in the world.
The Evolutionary Christian Church will require a few more rather large changes in the future, or at least changes in emphasis, which should not be thought of as evil. Conservatism supports traditions, but not to the point of ignoring the reality of change in nature and change in the kosmos, where God created the laws of evolution, which affirm the reality of change.
Science has damaged Christianity, but Christian's who cannot accept the truths of science have also damaged Christianity. Science can bring a deeper understanding of Christianity, but this deeper understanding requires at least a change in Christian emphasis. Traditionalists who refuse any kind of change refuse the changes that God affirms in an evolutionary kosmos, and this cannot be virtuous, especially if refusing change leads to destroying all traditions, and in destroying traditions the people of the West are destroyed.
Two choices facing Vatican II were: (1) If we do not change we will decline and perhaps fall, and (2) if we change we will decline and perhaps fall. The Church was declining before VII, perhaps because it rejected much of modern knowledge, and it has declined since VII because it accepted much of modern knowledge.
This can be resolved by affirming Evolution as both a scientific and religious principle. We evolve materially and spiritually to Godhood. We accept the spirit of VII as eventually moving toward refining and synthesizing the evolutionary goal of Godhood. But traditionalists can certainly retain Church traditions all the way back to Christ, and affirm the same God we affirm, Who is also Him whom we must evolve to.