What's the biggest threat to full, conscious, active participation in the liturgy by the laity? IMHO, it's continual change. Go read this.
Gerard Serafin rightly highlights the fact that a "lifetime of tradition" is being undone. The stated purpose of the change (read the article to find out what I'm talking about) is hardly a no-brainer, in that one might easily contest it.
However, the Lord has not entrusted me with the duty to oversee every liturgy in every parish and diocese throughout the world, so the best thing for me is probably to shut up and pray that I might respond myself to the abundant graces which the Father has bestowed on me through His Son and in His Spirit.